From Longman Dictionary of Contemporary Englishwet suitˈwet suit noun [countable] 
DSDCCa tight piece of clothing, usually made of rubber, worn by people who are swimming, surfing etc in the sea
DSDCCa tight piece of clothing, usually made of rubber, worn by people who are swimming, surfing etc in the seaExamples from the Corpus
wet suit• By dawn, the 46-year-old Agoura Hills businessman dons a wet suit, picks up a surfboard and catches waves.• Now he had to put on a wet suit, and emerged after half an hour feeling very chilly.• Costume Supervisor Daphne Dare designed their appearance, basing their shape on a standard skin-diver's wet suit.• He had only just peeled off the wet suit used during his inspection.• As I stripped off the wet suit, I thought over our situation.• The wet suit should be tight fitting and allow reasonable freedom of movement. 