The original civilian variant of the peaked cap was widely worn by sailors and workers from the mid 19th century onwards. These were made of wool or canvas, and sometimes waterproofed with tar. During the 1960s, blue denim Greek fisherman's caps became an essential accessory for the counterculture due to their use by John Lennon of the Beatles. A black leather version, sometimes embellished with chains or metal studs, was worn by bikers, greasers imitating Marlon Brando in "The Wild One", and members of the 1970s Black Power movement.