That's some quick thinking on your part! Lol. Vegan leather is all the rage now but it would feel like you were wrapped in Saran wrap. Seems like it would result in profuse sweating and hypothermia.
I can honestly see animal rights activists' point about not wearing fur because the animals are just raised for that purpose. Leather, on the other hand, would just be thrown away if it wasn't used as long as people are still eating meat.