you know, I just made a mistake. I was going to kill the emperor as the dark brotherhood assassin. I told myself; I will go there, add poison to the food, kill the emperor, and as the Astrid says there will be no problem to come back; the path is open and there wouldn't be any fight!" then I decided to wear the Cicero's clothes to move faster.
you know what happened! so I told myself that I will never do a risk like that! the normal clothes are real [....]!
You should put that in spoiler tags.
As for the normal clothing, NPCs have to wear something. And I admit I don't like to wear armor when I'm in a city - I usually roleplay that my character gets home, leaves the armor, puts something comfortable on and then goes shopping, visiting the Jarl, mixing potions and stuff.
Aside from roleplaying, though, it only makes sense for mages who don't want to wear armor. Enchanted clothes are just as good - if not better - than robes.
I miss being able to wear clothes under armor. I spent so much time looking for the perfect combination
