Denim is one of those materials I find fascinating. Initially designed as workwear, they've since become ubiquitous throughout the fashion world. Jeans are as easily found in a walmart for $15 as in a designer store for $500. From humble beginnings we have come far.
I find the color of denim extraordinarily interesting. The blue traditionally came from natural indigo, a dye exported mainly from the far east and part of Africa. It's a dye with an ancient history tied with many cultures, particularly Japan, which has a very old tradition of producing exquisitely indigo-dyed cloth. In fact, some of the most expensive denim is Japanese selvedge denim, which is highly prized for its quality and deep indigo color (selvedge actually refers to the weaving process of creating the denim, but these other qualities have come to be associated with it).
Our national costume.