Riveted jeans
A German-Jewish dry goods merchant Levi Strauss was selling blue jeans under the "Levi's" name to the mining communities of California in the 1850s. One of Strauss's customers was Jacob Davis, a tailor who frequently purchased bolts of cloth from the Levi Strauss & Co wholesale house.
After one of Davis's customers kept purchasing cloth to reinforce torn pants, he had an idea to use copper rivets to reinforce the points of strain, such as on the pocket corners and at the top of the button fly. Davis did not have the required money to purchase a patent, so he wrote to Strauss suggesting that they both go into business together. After Strauss accepted Davis's offer, the two men received U.S. Patent 139,121, for an "Improvement in Fastening Pocket-Openings," on May 20, 1873.
In 1885 jeans could be purchased in the US for $1.50 (approximately $34 in 2007). Today, an equivalent pair of jeans can be purchased for around $80, but more stylish pairs can cost much more. Many pairs of jeans are currently available for much less.
Traditionally, jeans are dyed to a blue color using indigo dye. Approximately 20M tons
of indigo are produced annually for this purpose, a few grams of the dye are required for each pair of trousers. 