If the bra is worn with a top through the neck, it is usually either strapless or on its own so as not to expose the back straps of a typical bra. A halter is a variation of a sleeveless shirt, similar to a T-shirt (as defined in American English), but with the straps tied. behind the neck. The other style of thong top has only a narrow strap behind the neck and a narrow strap behind the middle of the back, so it is mostly backless. This design resembles many bikini tops, although it covers more of the chest and may cover part or all of the front of the belly.