According to the Levi Strauss, May 20 was the day that Levi
Strauss and Jacob Davis, the innovators behind the sturdy blue
jeans got a patent on the process of adding metal rivets to
men’s denim work pants for the first time in history.
Jeans are named after
the city of Genoa in Italy, a place where cotton corduroy,
called either jean or jeane, was manufactured. Prior to the Levi
Strauss patented trousers, the term "blue jeans" had been long
in use for various garments (including trousers, overalls, and
coats), constructed from blue-colored denim.