Okay, so my bank 'toon is a hunter, and she happens to be wearing that mail belt in this screen shot. BUT! There is always a 'but'. Juju Belt looks awesome with this robe, for a bank 'toon, although it requires level 24 to get from a quest (Horde only) in Northern Stranglethorn.
For those of you who have low-level bank alts, the Tattered Cloth Belt is available from vendors and looks excellent with this dress.