Swimsuit
Definition 1 of 1
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Context Matters
Use 'swimsuit' for clothing worn specifically for swimming, not casual waterside wear. She changed into her swimsuit to go for a swim, not to sunbathe.
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Activity-Specific
'Swimsuit' implies the person intends to swim, unlike general beachwear or sunbathing attire. He wore only his swimsuit while learning to surf.
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Gender Differences
Men's and women's swimsuits differ in style; men's are often called 'trunks'. The store had a variety of men's swimsuits, mostly trunks and board shorts.