The wind changes direction and the wave sailing gets better on the other side of the bay? It’s too cold to change on the beach and in 3 minutes drive you could change at home? You rigged on dirt? How not to get your leather or brand new car seat dirty and salty?
Either you don’t care, but if you do, here is a the quick 100 grams Point-7 seat cover to throw over any car and van seat. Once you don’t need it any more, in 2 seconds you take it off and throw it under the seat for next use. Fast and practical.