My mage wears boring blue/gray tunic and leggings . Why is there no long purple or red robes ? or at least something more mystical looking ?
I would like to have a dye or colour option too, maybe there could be a workshop where a alchemist could mix dyes. A tailor shop too would be good.. it is possible to make plate or leather armor but not cloth.

Here is a video with most of the games mage wear

http://www.youtube.com/watch?v=q8PF2_roPkc

Some of the stuff in that video is only available with console commands though. There is also a black mage hood with the long scarf down the back that can be equipped seperately onto any other item (but it's console command as well) it looks really nice on Ebony Mail or the mourners clothes (if your playing a female) and lots of other stuff as well.

If you are on PC it's easy to add these items, but even if you are on Xbox anyone with the game on PC can mod them into your game for you as PC and xbox saves are interchangeable.