Catsuit

From Voyeurweb's Wiki about Sex

A catsuit is a skin-tight one-piece garment with sleeves and long legs, and sometimes with feet or gloves, sometimes with a hood (the combination of which turns it into a zentai suit). It usually has a zip closure in the front or back, but other necklines are possible. It might be considered lingerie and mostly used as sexy nightwear.

Unlike a unitard, its use rarely involves sports, and it is usually made of leather, rubber/latex, polyvinyl chloride (PVC), or velour as well as the more normal spandex. It is identical to a unitard in construction, but the term "catsuit" tends to be preferred in fancy-dress costume or erotic contexts.