Yeah, variety is extremely important. My thinking is that if sith lords is like the first KOTOR, the initial clothing that comes with your party's characters (except your personal character) will be the most stylized, detailed, and a big indicator of that character's personality. If the designers just want to create more outfits specific to each character, that's even better.
As for armor having stronger defense bonuses, I agree. But in the first game they used the same model for jedi robes and just made them stronger at each level (Jedi, Jedi Knight, Master), I don't see why they couldn't just let you upgrade your initial robes/clothing as well since you'd be using the same model.