Impact Clothes Protection
Since the human body is really not very impact resistant, you are going to need to wear some protective clothes. Sometimes you just got to fall off your bike to avoid even more serious problem, you will need to minimize the injury from impact. That old saying it didn't hurt till I stop could very well apply to you. there are some very cool impact resistant clothing, jackets, pants, etc that come in the form of armor or padding. The are especially adapt at absorbing the impact and spread the load across the body. This reduces injuries. You probably have seen them already. The jackets looks like the rider is all bulked up. It has armor protection or pads where the body meets the road. Now Armor makes these but there are others. They can be expensive but if you can't afford armor then go for high density foam. Some protection is better than none at all.
Friction and Abrasion Protection Clothes
Ok, so now you have fell off your bike and are skidding quite rapidly. You need clothing that will protect you from abrasion, the friction of the asphalt against skin. Normally shirts and pants are no good in this type of situation. Your skin will help but only for a few seconds. What should I be wearing? The answer is leather. Haven't you noticed that the stunt drivers wear leather to protect them not just to look cool. It is part of their protective gear. Cordura and Kevlar are pretty abrasion resistant but can't match the protection of leather. Your leather jacket needs to be thicker than something your would wear on a date.