wet suit

wet suit
    n 1: a close-fitting garment made of a permeable material; worn
         in cold water (as by skin divers) to retain body heat
    

26 Moby Thesaurus words for "wet suit":
      air cylinder, aqualung, aquascope, bathing suit, bathyscaphe,
      bathysphere, benthoscope, bikini, diving bell, diving boat,
      diving chamber, diving goggles, diving helmet, diving hood,
      diving mask, diving suit, maillot, periscope, scuba, snorkel,
      submarine, swim fins, swim suit, swimming suit, tank suit,
      trunks