A bathing costume
One who bathes (cleans oneself with water, for example in a bathtub).
One who immerses oneself in water for pleasure or refreshment: one who swims (for example at a lake or beach).
A sunbather
One who gives a bath to another.
A one-piece swimsuit (for women)
A leotard or tights of stretchable jersey fabric, generally worn by dancers, gymnasts or cyclists.