From Longman Dictionary of Contemporary Englishbathing costumebathing cos‧tume /ˈbeɪðɪŋ ˌkɒstjuːm $ -ˌkɑːstuːm/ noun [countable] DSSDCC British English old-fashioned a swimsuit
Examples from the Corpus
bathing costume• I've seen her in a bathing costume when she was younger, but it has always been a dry one.• We wish her well, but advise her not to take a bathing costume.• She looked like a tank in her bathing costume, Hoomey thought, squat and powerful and belligerent. 