As I've said before this is a proper jacket for open topped cars.
Waterproof as it's horsehide, tough, well made and is the sort of thing you pass on to your grandchildren. Jacket is an Aeroleather Barnstormer.
Was wearing mine in the pouring rain as I grovelled in the mud at a wet Prescott as I fixed the starter alignment on the trike. All I had to do on the jacket afterwards was sponge the mud off.