seifuku

Etymology
From, from 制服 (tʃjèj-bjuwk) (compare 🇨🇬 zhìfú 制服), from  (tets-bək "official or ceremonial clothing", "mourning attire"), from 制 ("cut" > "designed" > "systematized") + 服 ("clothing").

Noun

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

Usage notes

 * Generally italicized as a foreign word.
 * seifuku can be used for any kind of Japanese school uniforms, not only the sailor suit type; serafuku is more specific for the sailor suit type.
 * nanchatte seifuku identifies the fake versions used in cosplay and kogal fashion.