Luckily the top of the car I slid across was smooth. still broke my shoulder though.
I still don't wear enough protective gear honestly. I always just wear jeans and MTB gloves. In my defence (I know there is no excuse) the bikes I ride now rarely go over 60.
Combat trousers, t shirt and mtb gloves for me. Broke one wrist and the other and both ankles were badly sprained and a good bit of skin lost too.