What's the noun for pantsuit? Here's the word you're looking for.
pants
(Canada) An outer garment that covers the body from the waist downwards, covering each leg separately, usually as far as the ankles; trousers. [from 19th c.]
(plural only, chiefly Britain) An undergarment that covers the genitals and often the buttocks and the neighbouring parts of the body; underpants. [from 19th c.]