Designed to be worn with the P53 Utility Shirt, the Marine Corps P53 Utility trousers were made from sage green herringbone twill (HBT) cotton.1 They featured two front pockets, a watch pocket and two hip pockets, the left one of which was secured with a single button. Replaced by the P56 sateen utility uniform, the P53 trousers were very rarely worn in Vietnam.1. Cataloging And Identification Guide For 20th Century Uniforms (Marine Corps Museum, 1987)