Etymology

From Japanese 制服 ‎(seifuku せいふく), from Middle Chinese 制服 (tʃjèj-bjuwk) (compare Mandarin zhìfú 制服), from Old Chinese (tets-bək "official or ceremonial clothing", "mourning attire"), from 制 ("cut" > "designed" > "systematized") + 服 ("clothing").

seifuku ‎(plural seifuku)

1. (Japan) A Japanese school uniform modelled on the sailor suit.