I've considered a changing poncho/robe in my recent years. I don't thin I'd be hanging out in it or anything, but it's not the worst development to consider. I think they look kooky, but it's literally two towels stitched together...
I can se driving home in a wetsuit if you live nearby and it's honest to god freezing (I'm picturing Jersey, NY, Maryland, etc.). No shame. But driving home in your wetsuit in California is pretty silly. I fill a 40oz hydro flask and change in a bucket. If I'm really on top of it, I bring a neoprene mat that I was given so my footsies don't have to touch the pavement. It seems one level less lame than those fake grassmats.