Thank you for bringing this to our attention. We believe that we have found a potential resolution that should alleviate if not resolve many issues similar to the one brought up in this thread. This potential resolution will be put in an upcoming patch. We'll keep an eye on this thread when it goes live to see how effective we were and adjust our efforts accordingly.
Do you already know about this issue being present for the Aspiring Knight's set? The chestpiece, at least, is an entirely different color based on the character's skin tone. I got it for one of my characters because of the normally dark color, but it bleaches out when equipped to him.