Mess dress uniform
Mess dress uniform is the most formal (or semi-formal, depending on the country) type of evening-wear uniform used by military personnel, police personnel, and other uniformed services members. == Background == First originating in the British Army in the 1840s (see below), this order of evening dress frequently consists of a mess jacket, trousers, a white dress shirt, and a black bow tie, along with orders, medals, and insignia.