Bombadear: My Mage @ Scarlet Crusade
You can see the items used here @ WoWhead.
The whole set was pretty much set up around that robe. I would love, at some point, to obtain the Crown of the Sun out of Sunwell to go with it, but in the meantime, this is a pretty easy set to obtain, as most everything is quest rewards, or green drops. One of my very favorite ‘Mogging sets so far.