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Why do polyester-Lycra leggings become loose around the knees even when they do not shrink? The answer may be fabric growth, a lesser-known textile property linked to incomplete elastic recovery. Learn how fabric growth occurs, how it is measured and what manufacturers can do to improve stretch-fabric shape retention.

Why do white or shiny elastic threads appear when polyester-Lycra fabric is stretched? This lesser-known problem, called elastane grin-through, can affect leggings, sportswear and fitted garments. Discover its causes, how it differs from transparency and how manufacturers can improve fabric coverage before bulk production.