There used to be a base layer/arm warmers that was crash resistant made by DeFeet. I could only find an older article about it. http://www.roadbikereview.com/reviews/defeet-introduces-line... They only made it for one year so it didn't sell well enough to continue making, it cost $200 at the time which is about six times what an ordinary base layer cost back then. I bought one when they went on clearance after the first year and it actually did kind of work in a crash, though since it is abrasion resistant what ended up happening is I got a burn on my shoulder where I slid on the pavement instead of losing all the skin.

Professional cyclists typically don't buy anything, almost everything they use is provided by sponsors, and/or to display tech/goods as marketing for sale later to amateurs.