Catsuit
From wipipedia.org
A catsuit is a skin-tight one-piece garment with sleeves and long legs, and sometimes with feet or gloves, sometimes with a hood.
Unlike a unitard, its use rarely involves sports, and it may be made of leather, rubber, PVC, or spandex.
It is identical to a unitard in construction, but the term 'catsuit' tends to be preferred in erotic contexts.