The most prominent feature of denim, a legendary fabric that was used centuries ago but still does not lose its topicality, is that the warp yarn was painted with indigo dye and the weft yarns were not painted white. Denim fabric is also referred to as blue jeans. But blue jeans are the name given to all garments that are made of denim fabrics, especially pants. Denim is a rough, durable and useful fabric used in the construction of sportswear and blue jeans, and is generally preferred for those produced from a single coat of 100% cotton yarn.