You explained your conditions and circumstances so exactly that I half expected a game mechanic (involving a dice roll and modifiers) to follow. :) I'm not sure if it's similarity of language, or my own internal picture of you as a gamer.

Decorative clothing: It's funny how sometimes you can be blatant about not wanting to be approached, and people will ignore it. I have a shirt which reads "I am not your potential friend" - I had to stop wearing it when I went running because people would stop me just to chat. Random strangers. After an afternoon where THREE people stopped me, all smiles, I started wearing more cheerful colours. Which worked, strangely. Apparently bright colours can mean "Nature says don't touch" in people as well.