Denim is a sturdy cotton warp-faced textile in which the weft passes under two or more warp threads. This twill weaving produces a diagonal ribbing that distinguishes it from cotton duck. The most common denim is indigo denim, in which the warp thread is dyed, while the weft thread is left white. As a result of the warp-faced twill weaving, one side of the textile is dominated by the blue warp threads and the other side is dominated by the white weft threads. This causes blue jeans to be white on the inside. The indigo dyeing process, in which the core of the warp threads remains white, creates denim's signature fading characteristics.
The name "denim" derives from French serge de Nîmes, meaning "serge from Nîmes". Denim was traditionally colored blue with indigo dye to make blue jeans, although "jean" formerly denoted a different, lighter, cotton fabric. The contemporary use of the word "jeans" comes from the French word Gênes, for Genoa, Italy, where the first denim trousers were made.
This post is part of the Blue Monday meme,
and also part of the Macro Monday meme,
and also part of the Through my Lens meme,
and also part of the Seasons meme.