A sturdy cotton twill fabric characterized by its 3×1 warp-faced weaves. In this weave, the weft passes under two warp yarns to produce diagonal ribbing that’s identifiable on the reverse of the fabric. Traditionally, denim is made with indigo-dyed yarn for the warp and natural (or more usually bleached) yarn for the weft. Nowadays, denim is mostly associated with blue jeans. The word ‘denim’ is thought to have derived from ‘Serge de Nîmes.’ The word ‘serge’ referred to any type of woollen, semi-woollen and silk fabrics, made with twill weave. ‘Denim’ is thought to be short for ‘de Nîmes’ (‘from Nîmes’), a town in the south of France. It was an important textile region in the 18th century for materials such as serge and cloth. Denim first appeared in England in 1695 and has been used in the USA since the mid-19th century. Denim initially gained popularity in 1873 when Jacob Davis, a tailor from Nevada, manufactured the first pair of ‘rivet reinforced’ denim pants.