Road rash type wounds do very well with moisture retaining dressings like "Tegaderm" , "2nd Skin", or "Spyroflex". You can usually find one of them in a drug store, or someplace with hiking supplies like REI, EMS, or Campmor. These keep the wound moist, letting the new skin cells migrate across the surface for faster healing, and also minimize scarring. They are also quite protective themselves. I was still wearing one on a road rashed knee when I hit a sand washout on an unfamiliar road and went down. I acquired some more road rash around the Tegaderm, but the original injury was protected completely.

Tights may give some protection, but I've also gotten "Tight rash" in a fall that did not tear the tights, but did make a mess of my knee.

Yes, yes, I know my handling skills aren't great. I'm working on it.