From Longman Dictionary of Contemporary Englishbeachwearbeach‧wear /ˈbiːtʃweə $ -wer/ noun [uncountable] DCCDSSclothes that you wear for swimming, lying on the beach etc
Examples from the Corpus
beachwear• No water in sight, although beachwear is the fashion of the day.• But beachwear isn't our thing.• As we pass a couple of girl guests clad in complete colour-coordinated beachwear outfits, they whisper about us.• Also the hottest beachwear in town. 