Have you ever noticed a polyester T-shirt with a printed design that looks slightly tilted, even though the printing process was performed correctly?
Or a striped sportswear fabric where the horizontal lines appear curved instead of straight?
These problems may be related to two lesser-known textile defects: fabric bowing and fabric skewing.
Both defects involve distortion of the fabric's structural alignment. They can affect cutting accuracy, garment appearance, print placement and overall production quality.
For clothing manufacturers and bulk polyester fabric buyers, understanding bowing and skewing is important because these defects may remain unnoticed until fabric is spread, printed, cut or stitched.
In this guide, we explain the differences between bowing and skewing, their causes, how they are measured and how manufacturers can reduce them.
1. What Is Bowing in Knitted Fabric?
Bowing is a fabric distortion in which the courses or crosswise structural lines curve across the fabric width instead of maintaining their intended alignment.
In knitted fabrics, courses are the rows of interconnected loops running generally across the fabric.
When bowing occurs, these rows may form a curved or bow-shaped pattern.
Imagine drawing a straight horizontal line across a piece of fabric.
In a properly aligned fabric, the line follows the intended crosswise direction.
In bowed fabric, the corresponding knitted course may curve upwards or downwards towards the centre.
This distortion can become particularly noticeable in fabrics containing horizontal stripes, checks or repeated patterns.
Common Signs of Fabric Bowing
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Horizontal stripes appear curved.
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Printed patterns look uneven across the width.
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Fabric courses do not follow a straight crosswise line.
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Garment panels show distorted pattern alignment.
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The centre of the fabric appears displaced relative to its edges.
Bowing may be difficult to identify in plain solid-coloured fabrics without close structural inspection.
However, it can become obvious in striped or patterned garments.
2. What Is Skewing in Knitted Fabric?
Skewing occurs when the fabric's crosswise structural direction becomes inclined rather than remaining perpendicular to the lengthwise reference direction.
Instead of appearing straight across the fabric width, the courses run diagonally.
For example, a horizontal stripe may begin at one height on the left edge of the fabric and reach the right edge at a different height.
This creates an angular distortion.
Common Signs of Fabric Skewing
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Horizontal stripes appear diagonal.
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Checks or geometric patterns look tilted.
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Garment panels become difficult to align.
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Cutting patterns may not follow the intended grain direction.
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Finished garments may display uneven pattern positioning.
Skewing is especially noticeable in fabrics where the design depends on straight horizontal or vertical alignment.
3. Bowing vs Skewing: What Is the Difference?
Although bowing and skewing are often discussed together, they describe different distortion patterns.
| Feature | Bowing | Skewing |
|---|---|---|
| Fabric distortion | Curved crosswise lines | Diagonally inclined crosswise lines |
| Visual appearance | Bow-shaped or arched | Slanted or angled |
| Typical effect | Centre-to-edge displacement | Edge-to-edge displacement |
| Visibility | Curved stripes and patterns | Tilted stripes and patterns |
| Possible causes | Uneven tension, finishing and processing | Uneven tension, knitting geometry and processing |
| Main production concern | Pattern distortion | Grain and alignment distortion |
A fabric can also experience bowing and skewing simultaneously.
For example, a crosswise stripe may be both curved and inclined.
This creates a more complex distortion that can be difficult to correct during garment manufacturing.
4. Why Do Bowing and Skewing Occur in Polyester Knitted Fabric?
Bowing and skewing are not caused by a single manufacturing problem.
They can develop during knitting, dyeing, finishing, fabric handling or a combination of these processes.
4.1 Uneven Fabric Tension
Uneven tension is one of the important causes of fabric distortion.
During textile processing, fabric passes through rollers, guides and tension-control systems.
If the fabric experiences different tension across its width, the knitted structure may become displaced.
For example, the centre of the fabric may experience a different longitudinal strain from the edges.
This can contribute to bowing.
Uneven tension between the two sides may contribute to skewing.
Maintaining controlled and balanced fabric tension is therefore important.
4.2 Circular Knitting Construction
Many polyester knitted fabrics are produced using circular knitting machines.
In circular knitting, the yarn forms interconnected loops around a cylindrical needle arrangement.
The resulting course geometry may have a helical component.
Depending on machine configuration, yarn characteristics and finishing conditions, this can influence the alignment of the fabric structure.
Circular-knitted fabrics therefore require appropriate processing and inspection to maintain acceptable course alignment.
4.3 Improper Fabric Feeding During Finishing
Fabric finishing machines use rollers and guiding systems to move fabric through different processing stages.
If the fabric enters the machine unevenly, one section may advance differently from another.
This can distort the crosswise structural alignment.
Possible contributing factors include:
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Uneven fabric feeding.
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Incorrect roller alignment.
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Differential tension.
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Poor fabric guidance.
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Inappropriate machine settings.
These conditions may create or increase bowing and skewing.
4.4 Uneven Heat-Setting Conditions
Polyester is a thermoplastic fibre.
Heat setting is commonly used to improve dimensional stability and control fabric properties.
However, inappropriate heat-setting conditions can contribute to distortion.
Important processing variables include:
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Temperature.
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Exposure time.
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Fabric width.
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Overfeed.
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Fabric tension.
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Machine speed.
If the fabric is held in a distorted position during heat setting, some of that distortion may become stabilized.
For this reason, fabric alignment should be controlled before and during heat setting.
4.5 Incorrect Stenter Machine Settings
A stenter is commonly used in textile finishing to control fabric width, drying and heat setting.
The fabric is carried through the machine while its edges are held by clips or pins.
If the fabric is introduced with uneven alignment or inappropriate overfeed, bowing or skewing may develop.
Stenter operators must control fabric feeding and alignment carefully.
Some finishing lines use bow and skew correction systems to detect and adjust structural distortion before the fabric exits the machine.
4.6 Uneven Fabric Relaxation
Knitted fabrics can retain stresses from earlier processing stages.
When the fabric relaxes, these stresses may be released unevenly.
This can change the alignment of courses and wales.
Improper relaxation before finishing or cutting may therefore contribute to dimensional distortion.
4.7 Dyeing and Wet Processing
During dyeing, knitted fabric is exposed to water, heat, chemicals and mechanical movement.
The fabric may undergo changes in shape and dimensions as internal stresses relax.
Inadequate process control can contribute to uneven distortion.
The risk depends on fabric construction, machine type, loading conditions and processing parameters.
4.8 Fabric Handling and Rolling
Fabric distortion can also be influenced by handling after finishing.
Excessive tension during rolling or inappropriate storage may temporarily change fabric alignment.
When the fabric is opened and relaxed before cutting, some of these distortions may become visible.
This is one reason why inspection should take place under controlled conditions.
5. Why Are Bowing and Skewing Serious Problems for Garment Manufacturers?
Small fabric distortions can become more noticeable after cutting and stitching.
5.1 Crooked Horizontal Stripes
Consider a polyester sportswear T-shirt with horizontal stripes.
If the fabric contains bowing, the stripes may appear curved across the garment body.
If the fabric contains skewing, the stripes may appear diagonal.
Even when the garment is stitched correctly, the final appearance may be unacceptable.
5.2 Incorrect Pattern Alignment
Garments containing checks, engineered stripes or repeated geometric patterns require accurate alignment.
Bowing and skewing can make it difficult to match patterns between different garment panels.
This is especially important for:
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Sports jerseys.
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School uniforms.
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Corporate uniforms.
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Striped T-shirts.
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Polo shirts.
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Fashion garments.
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Sublimation-printed apparel.
5.3 Fabric Cutting Problems
Garment patterns are generally positioned according to the fabric's intended structural direction and the pattern's grainline requirements.
If the fabric is distorted, cutting panels may become more difficult.
The resulting garment can display:
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Uneven panel alignment.
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Distorted stripes.
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Asymmetrical appearance.
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Unexpected shape changes after relaxation.
5.4 Printing Alignment Issues
In sublimation printing, screen printing and other decoration processes, accurate design placement is important.
If the underlying fabric structure is distorted, prints aligned to the fabric edges may not align with its knitted courses.
This can be particularly noticeable in geometric or engineered designs.
5.5 Increased Production Rejection
Fabric bowing and skewing may lead to:
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Additional inspection.
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Cutting delays.
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Fabric wastage.
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Rejected garment panels.
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Rework.
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Customer complaints.
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Shipment delays.
For large production orders, even moderate distortion can create significant costs.
6. Are Bowing and Skewing More Visible in Printed Polyester Fabric?
Yes, they are often easier to notice in printed or patterned fabric.
A plain polyester fabric may contain structural distortion without showing an obvious visual defect from a distance.
However, horizontal stripes, checks and geometric patterns provide clear visual reference lines.
Even a relatively small deviation can become noticeable.
For example, a horizontally striped fabric may appear acceptable when folded.
Once opened across its full width, the stripes may reveal a curved or diagonal path.
This is why patterned fabrics often require particularly careful bow and skew inspection.
7. Can Bowing and Skewing Occur in 100% Polyester Fabric?
Yes.
Polyester fibres generally have good dimensional stability, but the stability of the fibre does not guarantee perfect alignment of the knitted structure.
Bowing and skewing are influenced by fabric construction and processing conditions.
Therefore, even a 100% polyester fabric can develop structural distortion.
The same applies to polyester blends and polyester-Lycra fabrics.
8. Which Polyester Fabrics Can Experience Bowing and Skewing?
These defects can occur in several knitted polyester constructions.
Examples include:
Single Jersey: Widely used for T-shirts and lightweight apparel.
Interlock: Used for structured garments and selected sportswear applications.
Piqué: Commonly used for polo shirts and uniforms.
Honeycomb: Used for textured sportswear and casualwear.
Mesh: Used for ventilation panels and performance apparel.
Bird-Eye: Commonly used in sportswear and activewear.
Polyester-Lycra: Used in stretch garments, leggings and fitted apparel.
The severity and visibility depend on the construction, pattern, yarn and finishing conditions.
No fabric type should be assumed completely immune to distortion.
9. How Are Bowing and Skewing Measured?
Textile laboratories and fabric inspection teams use established procedures to evaluate bowing and skewing.
One relevant reference is ASTM D3882 — Standard Test Method for Bow and Skew in Woven and Knitted Fabrics.
The test method provides procedures for evaluating the displacement of crosswise structural lines.
Measuring Bowing
Bowing is evaluated by measuring the maximum displacement of a crosswise line from an appropriate straight reference.
A simplified illustration is:
Bow Percentage = (Maximum Bow Displacement ÷ Fabric Width) × 100
For example:
Fabric width = 150 cm
Maximum bow displacement = 3 cm
Bow percentage = (3 ÷ 150) × 100
Bow = 2%
Measuring Skewing
Skewing is evaluated by measuring the displacement associated with the inclination of a crosswise structural line.
A simplified illustration is:
Skew Percentage = (Edge-to-Edge Displacement ÷ Fabric Width) × 100
For example:
Fabric width = 150 cm
Edge-to-edge displacement = 4.5 cm
Skew percentage = (4.5 ÷ 150) × 100
Skew = 3%
These calculations are simplified educational examples. Actual inspection and laboratory reporting must follow the measurement procedure and definitions of the selected test method.
Acceptance limits should be agreed upon between the buyer and supplier.
There is no single universal limit suitable for every fabric and garment application.
10. What Is an Acceptable Bowing or Skewing Percentage?
The acceptable amount depends on the buyer's quality requirements and intended application.
For example, a fabric used for a plain solid-coloured T-shirt may have different visual requirements from fabric used for a precisely striped uniform.
Similarly, fabric intended for engineered printing may require tighter alignment control.
Buyers should establish acceptable limits before bulk production rather than assuming that every fabric can follow the same tolerance.
The selected testing method, fabric construction and end use should all be considered.
11. Can Bowing and Skewing Be Corrected?
Some forms of bowing and skewing can be reduced during finishing.
However, correction depends on the cause and severity.
Mechanical Correction
Specialized bow and skew correction equipment can adjust the alignment of fabric as it passes through the finishing line.
These systems may use sensors and adjustable rollers to detect and reduce distortion.
Controlled Stenter Processing
Appropriate fabric feeding, tension control and alignment during stenter processing may help reduce distortion.
Fabric Relaxation
If the distortion is partly caused by temporary processing stresses, controlled relaxation may improve alignment.
Reprocessing
In selected cases, additional finishing may reduce distortion.
However, reprocessing is not always effective and may affect other fabric properties.
Severe distortion that has been stabilized during finishing can be particularly difficult to correct.
12. How Manufacturers Can Prevent Bowing and Skewing
Prevention requires quality control across multiple stages of production.
During Knitting
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Maintain consistent yarn feeding.
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Control stitch length.
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Monitor take-down tension.
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Maintain machine alignment.
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Inspect fabric structure regularly.
During Dyeing
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Use suitable machine loading conditions.
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Control processing tension.
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Avoid unnecessary fabric distortion.
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Monitor fabric behaviour during wet processing.
During Finishing
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Maintain proper roller alignment.
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Control overfeed.
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Monitor fabric width.
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Use suitable heat-setting conditions.
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Check bow and skew correction equipment where installed.
During Fabric Inspection
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Open representative fabric lengths.
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Inspect structural alignment.
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Check patterned fabrics carefully.
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Record defects before dispatch.
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Verify that rolls meet the agreed quality specification.
During Garment Production
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Allow appropriate fabric relaxation.
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Check grainline alignment.
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Inspect fabric before bulk cutting.
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Conduct trial cutting where necessary.
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Evaluate finished garment appearance.
13. Bowing vs Skewing vs Spirality
These three terms are related to fabric distortion but should not be treated as identical.
| Defect | Main Characteristic | Common Visible Result |
|---|---|---|
| Bowing | Curvature of crosswise structural lines | Curved stripes |
| Skewing | Inclination of crosswise structural lines | Diagonal stripes |
| Spirality | Torque-related angular distortion in knitted fabric | Twisted seams or garment body |
A fabric may exhibit more than one of these characteristics.
For example, an improperly stabilized circular-knitted fabric may show skewed courses and later develop visible garment twisting.
However, bowing, skewing and spirality should be evaluated according to their respective definitions and testing requirements.
14. Why GSM Cannot Identify Bowing and Skewing
GSM measures fabric mass per unit area.
It does not directly indicate structural alignment.
Two fabrics can have the same:
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GSM.
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DIA or width.
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Fibre composition.
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Colour.
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Yarn specification.
Yet one may have acceptable alignment while the other contains significant bowing or skewing.
This is why GSM alone cannot determine fabric quality.
For critical applications, buyers should also evaluate dimensional stability, structural alignment, colour consistency and other relevant performance properties.
15. What Should Bulk Buyers Ask Their Fabric Supplier?
Before purchasing polyester knitted fabric for a large garment order, buyers can ask:
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Has the finished fabric been inspected for bowing and skewing?
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What testing method is used?
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Are the results within the agreed acceptance limits?
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Has the fabric been properly finished and stabilized?
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Are the approved sample and bulk production from comparable processing conditions?
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Can representative rolls be inspected before dispatch?
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Is the fabric suitable for striped, printed or engineered garment designs?
These questions are especially important when sourcing fabric for uniforms, sportswear and patterned apparel.
16. Why Bowing and Skewing Matter in Sublimation Printing
Sublimation printing is widely used for polyester sportswear and custom apparel.
The process allows detailed designs to be transferred onto polyester fabric using heat.
However, the final garment still depends on accurate fabric alignment.
If the fabric is bowed or skewed, a design positioned according to the fabric edges may not follow the knitted structure.
This can cause visible alignment problems in:
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Team jerseys.
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Sports uniforms.
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Geometric patterns.
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Striped designs.
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Engineered garment graphics.
Manufacturers should therefore inspect fabric alignment before printing and cutting.
It is important to distinguish fabric distortion from printing-machine registration errors, because the corrective action will be different.
17. Why Fabric Inspection Should Happen Before Bulk Cutting
Once fabric is cut into garment panels, correcting structural distortion becomes much more difficult.
If bowing or skewing is discovered before cutting, the manufacturer may be able to:
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Segregate affected rolls.
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Request supplier evaluation.
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Consider corrective finishing.
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Adjust the production plan.
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Reject material that does not meet the agreed specification.
If the problem is discovered after stitching, the manufacturer may face additional labour, material losses and delivery delays.
Early inspection is therefore one of the most cost-effective quality-control measures in garment manufacturing.
18. Frequently Asked Questions
What is bowing in polyester fabric?
Bowing is a distortion in which the fabric's crosswise structural lines curve across its width rather than following the intended alignment.
What is skewing in knitted fabric?
Skewing occurs when the crosswise structural direction becomes inclined or diagonal relative to the intended fabric orientation.
Are bowing and skewing the same?
No. Bowing describes curvature, while skewing describes angular displacement. Both may occur together.
Can bowing affect sublimation printing?
Yes. Structural distortion can make engineered patterns and geometric designs appear misaligned, particularly when printing and cutting are referenced to the fabric edges.
Can heat setting reduce bowing and skewing?
Appropriate finishing and heat-setting procedures may help reduce certain distortions. However, heat setting alone does not guarantee correction.
Is bowing more visible in striped fabric?
Yes. Stripes provide visual reference lines that make curvature easier to detect.
Does higher GSM prevent skewing?
No. GSM is a measurement of fabric weight, not structural alignment.
Can plain polyester fabric have bowing?
Yes. The defect may be present even when it is not immediately visible.
Which test method is used for bow and skew?
ASTM D3882 is one recognized test method for evaluating bow and skew in woven and knitted fabrics.
Conclusion
Bowing and skewing are often overlooked because they may not be obvious when fabric is folded, rolled or inspected casually.
However, these structural distortions can significantly affect printing, cutting, pattern alignment and finished garment appearance.
Bowing causes crosswise fabric lines to curve, while skewing causes them to become inclined.
Both can develop through uneven tension, knitting geometry, dyeing, finishing and fabric-handling conditions.
For garment manufacturers, the most effective strategy is to identify these defects before bulk cutting.
For fabric buyers, understanding bowing and skewing provides another important way to evaluate textile quality beyond GSM, colour and price.
At Walrus – Yes India Can, we supply a wide range of polyester knitted fabrics for sportswear, T-shirts, uniforms, casualwear and bulk garment manufacturing.
Explore our polyester fabric collections and connect with our team for sourcing assistance.
Website: https://www.yesindiacan.in/
Contact: +91 90420 77722
