Honestly, I haven't seen that episode of American dad. I was looking for pictures of Morwen from Enchanter Forest Chronicles, and spotted this. Have you ever seen the original He-Man and the Masters of the Universe? I mean the 1980's one? This looks so close to Teela's outfit, it's scary.
Yes I have seen He man and It does look a lot like Teela's outfit that you mention it. If you're interested the title of that episode is "Dungeons and Wagons" maybe you can find it on you tube or something if you want to see it