There's waterproof, and then there's Flexothane®. This fabric starts off with a stretchy knitted base and adds a layer of polyurethane to block wind and rain 100%. Easy-moving stretch and tear-resistant around abusive chores. Also fully machine washable for easy care after every shift. You'd pay a ton for the civilian version—grab this military-spec model for a surplus price!
The Bane of Rain! Get your Belgian Coveralls now!