Robes were mentioned a few times in suggestion topics for future games. A couple people also wanted capes, like Seth or (IIRC) the head of the warrior guild wore.
There is robe armour in Beyond Divinity, though they are not full length wizard's robes. Incidentally, there is a unique robe armour in BD called Zandalor's Skin (hopefully that is figurative, rather than literal <img src="/ubbthreads/images/graemlins/silly.gif" alt="" /> ).
