I like my doctor character so much now that he got a "Scientist" skin, i have to suggest this:
Once a doctor 3 gets to level 21, he could go on the skin quest. Of course this is a permanent change, can't wear armor blah blah blah, but the point is the devs would not have to hand these out special in order for us to get them. They would be available in-game in very limited ways via quests, and only earned by reaching the level cap (or higher?). When someone asks a GM for a skin, the standard canned answer could simply be "find that quest".
This idea is not limited to the scientist skin for doctors. It could be 1 or 2 skin options per related character type. What i can tell you is that people seem to be much calmer in the presence of the scientist doctor guy, than they were over a generic bluesuit doctor, which makes using him as a healer more fun.