Extreme Slingshot Bikini
A sling bikini is a one-piece woman's swimsuit which provides as little coverage, or as much exposure, as a bikini. Usually, it is worn like a bikini bottom with the side straps, instead of going around the hips or waist, extending upwards to cover the breasts and go over the shoulders, leaving the entire sides of the torso uncovered. The straps then reach down the back to become a thong.
Sling bikinis are sometimes referred to as monokinis, though this usually refers to a garment which leaves the breasts uncovered.