Although keiko (a type of female formal outfit: a set of kiribakama (a instep-length Japanese skirt) and uchigi (or uchiki, a Japanese garment worn mostly inside a coat)) for formal attire, white keiko or suikan (a non-starched garment worn ordinarily in ancient Japan) for ceremonial attire, and suikan for everyday attire were provided in the old code enacted in 1946, the new code was published in 1987 because it was very difficult to move wearing keiko despite its gorgeousness, which has continued to this day.
昭和21年（1946年）に制定された旧規定では、正装に袿袴（けいこ/足の甲までの長さの切袴と言う袴と袿のセット）、礼装に白い袿袴か水干、常装に水干が定められていたが、袿袴姿は豪華だが非常に動きにくかったため、昭和62年に新しい規定が発表され現在に至る。