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Fluorescent orange, yellow, green and pink polyester fabrics rely on colour systems whose visual brightness can be sensitive to light exposure. Strong initial fluorescence or saturation does not guarantee outdoor colour stability; the outcome depends on dye selection, processing, exposure spectrum and finishing.

Two polyester fabrics with similar GSM can hang very differently. Drape depends on bending and shear resistance, weight distribution, knit structure and finishing. A drape coefficient provides a controlled way to compare a fabric's projected shape, while a garment wear test shows how those properties affect real silhouettes.

A white polyester jersey may appear opaque on a folded swatch but become visibly translucent when stretched across a body or when wet. The useful quality question is not simply GSM: it is how much of the backing or skin can be seen under realistic extension, moisture and illumination.

Denier, decitex (dtex) and tex describe yarn linear density, or mass per specified length. They are three different units for the same physical quantity. Before comparing polyester suppliers, convert to one common unit and confirm whether the number refers to a whole yarn, an individual filament or a plied assembly.

Bird-eye and honeycomb are commercial fabric-pattern descriptions, not universal laboratory performance classes. Bird-eye commonly describes a fine repeated eye-like texture; honeycomb generally describes a more pronounced cellular relief. Real airflow, moisture management, snagging and drape depend on the specific yarn and knit construction.

Tricot and Raschel are two major families of warp-knitting equipment. Tricot is often selected for comparatively fine, smooth and stable structures; Raschel machines are widely used for patterned openwork, nets, lace and 3D spacer constructions. Both families have exceptions, so a buyer should specify fabric properties instead of treating machine names as guaranteed performance.

Heat-transfer decoration can fail because the adhesive separates from the polyester surface, or because disperse dye migrates from dark polyester into a transfer film. Peeling is a bond-durability problem; pinking or colour bleed is a migration problem. A successful solution must identify the failure mode before changing press settings.

An elastic band inside a polyester shorts casing can rotate, roll or fold when it has too much clearance, uneven tension, insufficient anchoring or incompatible width and stiffness. The resulting pressure points affect comfort and appearance even if the outer fabric passes GSM and strength testing.

Honeycomb polyester fabric has a visually textured cellular knit surface. That structure may change air gaps, liquid paths and skin contact, but it does not automatically make a fabric moisture-wicking or quick-drying. Yarn, finishes, GSM, fabric thickness and laundering history all affect measured performance.