I just found something that may work for you! If you have facebook check out saddle jeans. My friend just sent me the link. Kind of goofy, but hey I would think it would save your thighs! I really am thinking about ordering some. ;)
For all who don't have facebook or rarely venture on like me;; http://saddlejeans.com/
AND, honestly I feel that is a bit steep for the price. I think I may attempt making a pair for my saddle, lol.