Abstract: A convertible swimsuit is a one-piece bathing suit that can be changed to a two-piece tank top style or bikini style bathing suit for purposes such as, but not limited to, tanning or using the restroom. This is accomplished by unfastening the upper piece of the swimsuit from the lower piece of the swimsuit. The material at the bottom of the upper piece of the swimsuit is folded upward and fastened behind the back to create a two piece tank-top style bathing suit. The material can again be folded further upward and fastened either behind the back or behind the neck to create a bikini-style bathing suit. The wearer can thereby use the swimsuit as either a one-piece swimsuit or as a two-piece swimsuit with adjustable coverage of the individual's stomach or midriff.