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Seam elongation measures how much a sewn seam can extend before restriction or failure, especially important in stretch polyester garments.

Phenolic yellowing is a storage-related discolouration risk that can affect white and pale polyester garments, especially when packaging chemistry, heat and alkaline conditions interact.

Calculate polyester sewing-thread requirements from seam length, stitch type and measured consumption ratio, with worked examples and production allowances.

A garment can use recycled polyester and still be difficult to recycle again. End-of-life performance starts at the design stage.