Jeep cap
The jeep cap, sometimes referred to as the jeep hat, originally the US Army issued Cap, Wool, Knit, M1941 is a knit cap with a short visor made mostly from knitted yarn, originally wool, but now typically acrylic. Also sometimes referred to as a "skull cap" due to its popularity with skateboarders (although the term "skullcap" is also used for a variety of completely different caps), or a "Radar cap" due to the cap being made famous by the character Radar O'Reilly from the hit US TV sitcom M*A*S*H. == Origin == The "jeep cap" was first issued by the United States Army in February 1942 during World War II; the purpose of the jeep cap was to be worn underneath the heavy combat helmets to offer soldiers both extra padding and warmth.