is a skin-tight one-piece garment
with long legs and sometimes long sleeves. It differs from a leotard
in that a leotard does not have long legs.
Unitards are worn by acrobats, gymnasts, dancers and circus performers, as well as others.
Unitards can also be worn as lingerie and are eroticised by some people, often as part of a wider spandex fetishism.
In erotic or costume use, they are usually referred to as catsuits.