Wiktionary
cupless
a. Without a cup.
Usage examples of "cupless".
A half-corset encased her ribs, its cupless top pushing her breasts into firm mounds of delightful brown-tipped meat.
Similarly, the now purple bruises left on her breastflesh by Duke were somehow complemented by the cupless lilac basque that was hooked tightly beneath them.
She pulled a pair of crotchless panties onto the mannequin and then added a cupless bra.
Some talented artist had painted fishnet stockings, a frilly white garter belt, a lacy white cupless bra and tiny white crotchless panties on her tanned skin.