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30% More Stretch: Cotton Knit Fabric for Sewists and Makers Cotton knit fabric is cotton yarn formed into cloth by interlooping stitches rather than weaving threads over and under each other. That looped construction is why knits stretch and drape against the body instead of holding a stiff shape, which is exactly why they dominate T-shirts, underwear, and activewear. If you’ve ever wondered why a woven cotton shirt feels structured while a cotton tee gives with your movement, the loop is the answer. TL;DR: Cotton knit fabrics vary widely in feel and performance based on construction type, …