Deralia would be great! I always wanted to know, what Revan's homeworld is like. Dantooine, Alderaan and Naboo are too equal, to be put together in one KotOR. I'd rather have more different places like in KotOR. KotOR II was inferior in that point, too. Smaller worlds with the same dark atmosphere on every planet... that was so boring! My choice would be: Coruscant, Naboo, Tatooine, Hoth, Korriban and Deralia.
I like the idea with the robes. You could have some advantages while fighting Jedi or Sith without a robe (saving throws etc.). That also might be the reason, why they are taking off their robes in the Star Wars Movies .