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Jeans are trousers made from denim. Some of the earliest American blue jeans were made by Jacob Davis, Calvin Rogers, and Levi Strauss in 1873. Starting in the 1950s, jeans, originally designed for the U.S. Army and working people, became popular among teenagers. Historic brands include Levi's, Lee, and Wrangler. Jeans come in various fits, including skinny, tapered, straight, boot cut, Mommy-cut, maternity, and flare.