kigurumi

Meanings

1. A full-body costume of a cartoon character (typically a mascot of cartoonish proportions) originating in Japan.
2. A full-body cosplay of a human cartoon character with realistic proportions paired with an anime-style mask, originating in Japan; also (metonymic), the anime-style mask used in such a cosplay.
3. A themed onesie, typically in the style of a cartoon animal.

Etymology

Borrowed from Japanese 着ぐるみ (kigurumi), from 着 (gi, “clothes, outfit”) + ぐるみ (-gurumi, all together, inclusive) (referring to the fact that the costume completely encloses the wearer).