南洋庁
On March 2, 1908, an Imperial edict established substitute court uniforms for diplomats dispatched to the tropics or very hot areas. Later, on September 29, 1926, another Imperial edict established alternative court uniforms and court dress for Japanese officials in the South Pacific. All of these consisted of white tunics. Old news footage shows officials of the South Pacific Mandate, including Kōki Hirota, in these clothes.