Not that I know of. In fact, I've been looking for a hak pack that makes robes actually look like robes, but I haven't been able to find one yet
While I know I shouldn't be worried about such petty things as clothing appearance, it is just a little to silly to have my wizard running around in robes that look like '80's jumpsuits. Same goes for dresses. Why are all the NPC females wearing leather tights or even armor in some cases?
Hmm, back to your question. At character creation you can make your wizard have the "hooded" appearance, which may be more of what you're going for. However, NWN won't let you change your character's appearance after you start playing them..