
Twill tape is a flat twill-woven ribbon of cotton, linen, polyester, or wool. Twill tape is available in various widths, generally up to 1 inch (2.5 cm), and a wide range of colors. Twill tape is used in sewing and tailoring to reinforce seams, make casings, bind edges, and make sturdy ties for closing garments (for example, on hospital gowns). Tw...
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http://en.wikipedia.org/wiki/Twill_tape

A flat non-stretching woven ribbon of cotton, linen, polyester, or wool. It is used to stabilize seams or edges
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https://sewguide.com/sewing-terms-glossary/
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