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you are on the right track THE WORDING IS EVERTHING "RETHINK"

a wetsuit!

no nope you were closer before it is not a one word its multiple words and a drysuit is one of the words and everyone can see this so the first one to get it right wins

a drysuit that was peed in?

a drysuit underwater and a drysuit that was peed in

dude that made me laugh so another clue you what is in a drysuit and then put it together in a sentence

A person in a drysuit underwater is dry, but out of the water is wet with sweat