bodysuit

or bod·y suit

[ bod-ee-soot ]
/ ˈbɒd iˌsut /

noun

a close-fitting, one-piece, usually sleeved garment for the torso, having a snap crotch.
Compare body shirt, leotard.

Origin of bodysuit

First recorded in 1965–70; body + suit

British Dictionary definitions for bodysuit

bodysuit
/ (ˈbɒdɪˌsuːt, -ˌsjuːt) /

noun

another name for body (def. 16)
a one-piece undergarment for a baby