Princess Poobah's Dress is a one of a kind looking robe, obtained through a small quest line the Stranglethorn Vale, starting with 'Message in a Bottle' and ending with 'Mukla's Demise'
It is an excellent robe to have if you are looking for a one off design and want to look a little different from the rest of the casters.
The Postmaster's Band - (Postmaster Malown, Stratholme)
Swiftheal Mantle - (Taloring)
Princess Poobah's Dress - (Mukla's Demise, Cape of Stranglethorn quest)
Laughing Skull Gloves
Soulguard Girdle - (Taloring)
Guardian's Silk Footguards - (Armour Quartermaster)