Synonyms for Foundation garment:

n.

artifact (noun)
foundation.
foundation garment (noun)
foundation.
undergarment shaping figure (noun)
bra, brassiere, foundation.
underwear (noun)
body, briefs, brassiere, BVDS, bustier, boxers, camisole, bloomers, bra, body suit.

Other synonyms:

Other relevant words:
brassiere, bra.