A bra without cups; also called a open-cup bra. Designs vary, but in general the bra consists of only straps or strings that encircle the breasts, with no cups to cover the breasts or nipples.
For bras that are only an underwire "shelf" that holds up the breast, see the shelf bra tag.
Not to be confused with nursing bras, which cover the breast/nipple but still allow one to conveniently access the nipple through a slit.
