A swimsuit is worn by hooking each end of a thin cloth around each erect nipple.
The other end of the cloth should be worn by hanging around the neck (such as a choker), the other nipple, and anal.
Although it is called a swimsuit, it is almost naked in terms of cloth area, and due to its characteristics of being worn by hanging on the nipples, the nipples can hardly be hidden (exposed areolar) and the shape of the nipples can be clearly seen (nipples visible through clothing, nipple bulge).
When the nipples are hooked together and worn, it can be called a bikini, but when the cloth is stretched around the neck or crotch, it becomes more like a sling shot.
It is also a kind of nipple bikini in the sense that it hides only the nipples with minimal cloth, but in any case, it is closer to a lewder swimsuit than a bikini.
When worn with nipples and anal, the back is completely exposed.