Prior to the 20th century, the uniforms of the United States Army were primarily made out of dark blue wool. After the adoption of olive drab and khaki uniforms in 1902, the US Army retained dark blue uniforms as its full dress until 1917. The blue full dress ceremonial overcoat was reintroduced in January 1929, and saw alterations to its design in 1936 and 1937, before it was suspended from use in 1943. The overcoat was reauthorized for use by officers in 1947, although it sees seldom use. The ceremonial overcoat with a white scarf is presently listed as an optional purchase item in the Army's uniform regulations; with general officers, aides-de-camp, and command sergeant major being authorized to wear it in formal ceremonial occasions during cold-weather conditions.