The robe can be bought from a plane-traveling mage in Ribalds Aventures Mart thingy in Waukeen's Promanade.
BTW:She is near the back
I wish i could spell...
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<br /><br />\"Sa souvraya niende misain ye\"<br />~I am lost in my own mind~<br /><br />\"Paradise on my right, Hell on my left, and the Angel of Death behind.\"<br />~The Sirat: O.C. Bible~