A mariner's cap, also called a skipper's cap, sailor's cap, Dutch Boy's cap, Greek cap, fiddler's cap, or breton cap is a peaked cap, usually made from black or navy blue wool felt, but also from corduroy or blue denim. Originally popular with seafarers, it is often associated with sailing and maritime settings, especially fishing, yachting and recreational sailing. It has sometimes become a fashion item in the West, for example being worn by John Lennon in the mid-1960s.