Pants usually made of blue denim

Denim trousers, traditionally blue, originally cut from jean cloth (“jene fustian”), a heavy canvas made in Genoa, Italy. In the 1850s Levi Strauss (1830–1902), a Bavarian immigrant to the US, made sturdy trousers for goldminers in San Francisco out of jean material intended for wagon covers. Hence they became known as “Levis”. Later a French fabric, serge de Nîmes (corrupted to “denim”), was used. Denim jeans became fashionable casual wear in the 1950s in the US and have since been produced in a wide variety of styles by many designers