Denim (which gets its name from the French for "from Nîmes") is a rugged cotton twill textile, in which the weft passes under two (twi- "double") or more warp threads. This twill weaving produces the familiar diagonal ribbing of the fabric, which distinguishes denim from cotton duck. It is characteristic of any indigo denim that only the warp threads are dyed, whereas the weft threads remain plain white.
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"Some fabrics, like leather and denim, might cause permanent discoloration that will not wash off," Apple says about the ...