Sentence:  The women usually wore bikini tops with shorts, swimsuits underneath <WSD>cover-ups</WSD> or just swimsuits. Men came in various types of trunks, from traditional boxers, to Speedos, to G-string trunks that showcased their packages. 
Meaning of the word marked with <WSD> tags:  An item of clothing to be worn over a swimsuit while not in the water.