A bandeau is a garment comprising, in appearance, a strip of cloth. Today, the term most frequently refers to a garment that wraps around a woman's breasts in sports or swimwear, and now it is accepted as the top part of formal wear with pants or a skirt. It is similar to a tube top, but narrower. It is usually strapless, sleeveless and off the shoulder.
Very similar to chest_wraps, this tag should be used when the article in question is a single piece similar to a tube top whose function is primarily to support or cover the breasts, rather than as a binder or a bandage.
If it has molded cups then it is a strapless_bra