immersion suit
noun
a one-piece garment of neoprene or rubbery material, worn in cold water to aid buoyancy and insulate the wearer.
The grammatical form denoting more than one person, place, thing, or idea.
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They also learned how to put on one-piece, neoprene immersion suits, which cover the entire body except for the eyes and nose.
From Seattle Times ● Mar. 14, 2023