Last I checked, "priest" was not a term bound to any specific religion. Nun may be though. But priest/priestess? Not so much.
Edit: just looked over the new costumes, they look awesome! The only thing I could see that needed changing off the top of my head is how often they may use their breath weapon in the Dragon costume. Is it every round? 1d4 rounds like a normal dragon? And I might allow them to pick the color dragon they imitate when they first get the costume (but not be able to change it later once this choice is made), which would let them have a breath weapon of an element other than fire.
Oh, and you lost a few words in the description of the SLA the for Prince/Princess. It should read "Twice a day you can use a Suggestion and/or Charm Creature spell as spell-like ability cast as a level 15 sorcerer."
Hope this helps, and keep up the good work!