Jeans are a type of pants or trousers made from denim or dungaree cloth. Often the term “jeans” refers to a particular style of trousers, called “blue jeans”, with copper-riveted pockets which were invented by Jacob W. Davis in 1871 and patented by Jacob W. Davis and Levi Strauss on May 20, 1873. Prior to the patent, the term “blue jeans” had been long in use for various garments (including trousers, overalls, and coats),
constructed from blue-colored denim.

“Jean” also references a (historic) type of sturdy cloth commonly made with a cotton warp and wool weft (also known as “Virginia cloth”). Jean cloth can be entirely cotton as well, similar to denim. Originally designed for miners, modern jeans were popularized as casual wear by Marlon Brando and James Dean in their 1950’s films, particularly The Wild One and Rebel Without a Cause, leading to the fabric becoming a symbol of rebellion among teenagers, especially members of the greaser subculture. From the 1960’s onwards, jeans became common among various youth subcultures and subsequently young members of the general population. Nowadays, they are one of the most popular types of specialty trousers in Western culture.

    Source: Wikipedia