Jeans.2

Initially, blue jeans were simply sturdy trousers worn by workers, especially in the factories during World War II. During this period, men's jeans had the zipper down the front, whereas women's jeans had the zipper down the right side. By the 1960s, both men's and women's jeans had the zipper down the front.

Boot-cut jeans became part of the official working uniform of the United States Navy in the 20th century prior to being replaced by the coveralls and utilities uniform, mostly likely inspired by their usage by European sailors in the past. The reason being was to prevent other more traditional uniforms from becoming soiled or torn in the ship's rugged working environment and thus leaving them for wear during ceremonial occasions.