My gripe is that even when I'm not wearing any TG armor and walking through a city wear I've never stolen anything or trespassed (never been caught at it anywhere), I get guards calling me sneak-thief and warning me against lockpicking, etc. How in Oblivion could they possibly know? I could see it in Riften or in a place where I got busted for something, but not everywhere in Skyrim when I am and have been bounty free as far as thieving goes.
thats based on your skill. they have special dialogue options that trigger based on how high your skill in certain things are.