Unitard
From Voyeurweb's Wiki about Sex
A unitard is a skin-tight one-piece garment of lingerie 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, superheroes and circus performers, as well as others.
The term may also be used to refer to a 'wrestling singlet'.