 Aircrew on flying duties wear an olive drab flying suit in temperate regions or a khaki flying suit in desert regions.A leather flying jacket, purchased at individual expense, may be worn with the flying suit but only while the wearer is on the ground.RAF personnel on operations, exercise or in certain tactical formed units wear Multi-Terrain Pattern (MTP) Personal Clothing System Combat Uniform (PCS CU) is a camouflage uniform.