Although these robes just scream "blood elf mage", I'm staying true to night elves. Very nice for those specced fire!
Red Mageweave Headband
Scarlet Sin'dorei Robes
Dark Runner Boots
Book of Highborne Hymns
Personally I think off-hands are, along with wands, amongst the most underappreciated items in the game - which is sad, since there are quite a few items that have eye-catching designs.
I contemplated for a while to swap out the Mageweave Headband for the Circle of Flame for a garantueed mage feel, but sadly it's a different shade of red which throws the whole thing off. I think I did a much better job with the cloak this time (I like it when head and cloak items aren't hidden), and the set looks good without, for those who prefer hiding it.