Strapless bra
From wipipedia.org
A strapless bra is a bra with no straps over the shoulders. It is designed to be worn with a dress (such as an evening gown) or top that leaves the shoulders bare.
Such bras usually have a strip of silicone along the top and bottom edges to help keep them in place. It is important for the bra to be exactly the right size, as a loose one will offer little support to the breasts, and a tight one is likely to work its way down off the breasts.
