Denim is a firm, durable twilled fabric made of colored warp and white filling threads, usually cotton. It is a dark blue fabric commonly used to make durable work wear such as jeans and overalls.

It’s a sturdy cotton fabric having a twill weave that creates a refined diagonal ribbing pattern. In denim, the weft strands go under 2, or more strands, as well as the warp yarns, which seem to be more prominent on the very right side of the cotton twill cloth – which is warp-facing. Denim is distinguished from cotton duck and canvas, both of which are sturdy woven cotton fabrics, by the diagonal ribbing.