Okay, so here are some more pictures of possible uniforms.  I tried to pick ones that looked distinct from one another, but I may not have been too successful.

[hider=Uniforms]
[hider=1][img]https://staticdelivery.nexusmods.com/mods/110/images/45538-1-1383106307.jpg[/img]
Pretty basic uniform design.  Maybe for novices?[/hider]
[hider=2][img]https://i.pinimg.com/originals/71/e1/13/71e11328ed967b50c126fd5e47114ec0.png[/img]
Uniform with a typical hat instead of a hood[/hider]
[hider=3][img]https://i.pinimg.com/originals/77/ce/34/77ce34fd055c33992320a07563f6a381.jpg[/img]
Details are a little hard to see, but it appears to be more armored.  Maybe for the more martial mages?[/hider]
[hider=4][img]https://vignette.wikia.nocookie.net/elderscrolls/images/1/16/Mage_Robes_Male_1.jpg/revision/latest/scale-to-width-down/2000?cb=20131112230959[/img]
Pretty typical uniform here except for the fact that the robe and hood appear to be two separate pieces.[/hider]
[hider=5][img]https://i.pinimg.com/originals/bd/87/2a/bd872a2caaeef5cda7d4e61b4592a8ef.jpg[/img]
Uniform lacking a robe, instead opting to use a hooded cloak over mostly normal-looking clothing[/hider]
[/hider]

It might also be worth considering if we wanted each school of magic to have unique robes for the higher ranks or not.  This could be quite simple to implement by just color-coding the schools in a sense, but we could have completely different uniforms for each school if we wanted.  Go ahead and let me know what you guys think. :D