But someone could still fit your criterias and still be a bad player. Or worse, even a stressful person to be around. Someone with a stressful job or a relationship problem who lets off all steam at the table in a probably disrupting way is just what is not needed in any of our groups (we already have one of those in one of the groups and that we can deal with, barely).
And how anyone dresses is totally irrelevant to me as long as they are decently covered. The more excentric the clothes, the better probably. People who are able to show their individuality are usually creative people, it has little to do with not fitting in anywhere. Heck, it is their free time, they can dress however they want.
I just now remember one creepy guy I turned away some years ago who totally freaked me out by the way he stared at everything and everyone. He had the sort of eyes which, thanks to the respective movies, you might associate with a psychopath. I think that was the weirdest meeting I ever had with a potential player. I had the two other players of the group with me at that time, and all 3 of us very nerdy, comfortable with weird folks agreed that this was not somebody we'd not even want to work/going to school with, not talking of spending our free time with him.