A bodysuit is a leotard-like undergarment, sometimes used to provide support and shaping, sometimes simply as a top that cannot become untucked from one's trousers or skirt. It is usually skintight or formfitting. They can have long or short sleeves and be made like a tank top. Bodysuits are for both females and males. Unlike a leotard, a bodysuit also has snaps at the crotch. It is also called a snapsuit or a onesie.