Unfortunately This is, and always has been, te way Bethesda had things, even back in good old daggerfall

Well, for me there is no "good old daggerfall", since I haven't played it, unfortunately. However, if it were to be released nowadays (with improved graphics etc), I'd probably mod the **** out of it because I don't like many many things about it.
For me, Morrowind equals the "good old days" of TES. No mages wearing hoods all the time. Not every priest/mage wore a robe. Many Fighters Guild members wore common clothing instead of armor. It was insanely believable in so many aspects. And if I remember correctly, there were no "color codes" anywhere. The variety was amazing.
Anyway, I'm getting a little off-topic here.
On topic now: Please stop disagreeing with my first comment, washington already implied that he'd like to keep the retextured Emperor's Robe, and I already mentioned that I'm fine with that, and all you guys saying that you disagree with me makes me feel unloved for no reason.

BTW, speaking of Morrowind. There was one robe that many Imperial Cult members used, if I remember correctly. http://www.uesp.net/w/images/MW_Clothing_ExpensiveRobesM.jpg
If you could recreate that and use it in your mod, I'd be very very grateful. It is basically the first thing that comes to my mind when I think of the Imperial Cult.