I understand that putting on the armour makes you temporarily part of a certain faction but in TES (not knocking your idea) how would it work?
Maybe Bandit clans could have different armours or something but there are problems associated with this as well.
I wouldn't mind it though, they would have to get rid of the message that pops up every time you put it on, and put it as one that goes in the top left hand corner
Well in NV it only works on factions with a set 'uniform', I'd expect it to be the same if it's in Skyrim. Also, if this is in, and I would love to have it, I hope it's scripted so you have to wear a certain percentage of the outfit for it to work, not just the cuirass as the mods for this stuff in Oblivion are. Also, I agree that the message needs to go, maybe just a hud icon for which faction you are currently dressed as, or just an icon in the inventory.