Dress Blues Explained The Dress Blue uniform, worn by Marines, is steeped in history, with roots dating back to 1798 when the secretary of war authorized the wearing of a blue uniform A Marine inspects Marines in their dress blue delta uniforms. PICRYL Public Domain Media Search Engine Public Domain Search A colorized photo of a US Marine in Blue Dress uniform, circa 1917 : r USMC Blue Dress Coat for Male Officer The MARINE Shop Cobalt Blue Formal Dresses for Women Ever Pretty US USMC FEMALE ENLISTED BLUE DRESS UNIFORM ("A" AND B")