What is it that makes jeans so special? The history, the fabric, the durability, the details or a bit of it all. Briefly defined, jeans are made of indigo dyed denim and feature five pockets, twelve rivets, contrast stitching, five to seven belt loops and a zip or button fly. But there’s more to it than that. With a little help from fellow denim enthusiasts (including especially oki-ni), we have set out to investigate and identify the functions of the different components of the generic 5-pocket jean mainly based on the 1915 501XX and 1947 501XX from Levi’s Vintage Clothing. You may not find all these details on most jeans you can buy today, but nevertheless they’re all significant for the evolution of the jean.