The term 'Bikini Alternative' refers to two different types of swimwear: THONG and onepiece. A THONG is a type of swimsuit that covers the wearer's buttocks, but leaves the sides of the hips and upper thighs exposed. A onepiece is a type of swimsuit that covers the entire body from the neck to the ankles. Both of these swimsuits are considered alternatives to the traditional bikini, which typically covers the breasts, abdomen, and groin area.