American Apparel Jersey Tank Thong Bodysuit

Cotton / Spandex Jersey (95% Cotton/ 5% Elastane) building and construction
Small is about 23 1/8 (587 centimeters) in overall size”
Thong cut leg opening

https://www.spandex-costume.com/shop/lycra-spandex-leotard/jersey-tank-thong-bodysuit/