sweatpants

or sweat pants

[ swet-pants ]
/ ˈswɛtˌpænts /

noun (used with a plural verb)

loose-fitting pants of soft, absorbent fabric, as cotton jersey, usually with a drawstring at the waist and close-fitting or elastic cuffs at the ankles, commonly worn during athletic activity for warmth or to induce sweating.

Origin of sweatpants

First recorded in 1920–25; sweat + pants

British Dictionary definitions for sweat pants

sweat pants

pl n

loose thick cotton trousers with elasticated cuffs and an elasticated or drawstring waist, worn esp by athletes warming up or training