A dry fly moving along in the current is not going to give the fish a whole lot of time to determine if the legs are the right color or not. If the fish is feeding, he will more than likely hit the fly no matter what color the legs are. Just my opinion only. Trout are not the smartest fish we fish for, but, they definately know the difference between something that looks alive and something that does not. If the fly looks alive,( has movement) they will probably hit it. Just my one cent worth on this topic.

------------------
Warren