 Before World War I, most armed forces of the world retained uniforms of this type that were usually more colourful and elaborate than the ordinary duty (known as "undress"), or the active service dress uniform.While full dress uniform is predominantly worn at occasions by commissioned officers and non-commissioned officers, it may also be worn as an optional uniform by some senior enlisted personnel.It is also sometimes worn by members of royal courts, orders of chivalry or certain civilian uniformed services, although some of these may border to court uniforms.