Classic Frogman Watch Cap - NEW LOOK !The term watch cap was coined by sailors, who often wore these caps to keep warm while on their watch. Originating in World War II, these caps were standard issue in the US Navy as Sailors found themselves performing duties in some of the worst weather conditions imaginable. When the Sailors came home they brought their hats with them, and it became a popular style to have your watch cap rolled above your ears, high on your head at a jaunty angle.