1) Leotard kin 2) One-piece outfit 1) Unitard 
A bodysuit or shorthand body is a one-piece form-fitting garment that covers the torso and the crotch. The bodysuit often has sleeves and varying collars. A bodysuit is distinguished from the similar leotard by the use of snaps or hooks at the crotch. A bodysuit may be worn as a top for the smooth line it gives or because it cannot become untucked...
a close-fitting, one-piece, usually sleeved garment for the torso, having a snap crotch.