shapewear

noun

shape·​wear ˈshāp-ˌwer 

: tight-fitting undergarments designed to shape and smooth the body

… shapewear may be just the thing to wear under a clingy evening dress.

—Sylvia Rubin

Shapewear … isn't about shrinking your waist to the size of your wrist, or getting your booty back to its prepubescent years; it's about making your clothes look and fit better.

—Cloe Cabrera

In growing numbers, men are easing into a variety of shapewear, including elasticized tank tops …

—Jean Patteson

Word History

Etymology

shape entry 1 + -wear (as in sportswear, underwear)

First Known Use

1962, in the meaning defined above