Waterproofs are the jacket and trousers that keep rain out. Put on your waterproofs.
They must breathe as well as block, or you get just as wet from the inside. Waterproofs stop working when they are dirty, and washing them properly restores them.
1nounwaterproofsThe jacket and trousers that keep rain out.
“The waterproofs went on at the car park and stayed on.”
waterproofs is clothing.
waterproof comes from water + -proof. Compare West Frisian wetterproef (“waterproof”), Dutch waterproef (“waterproof”).
Etymology from Wiktionary, CC BY-SA