Not necessarily. I have friends who become entirely different people once they're in business attire. They don't seem to relax until after work, when they're in their "playclothes" and ready to have fun.
No, but from what you describe they may feel better about themselves and more confident when they're dressed up. And the different attitude shows.
I don't get what you're asking...so if a persons in a suit you like them and if they're in sweat pants you don't? I'm confused.
if I answer you that would be judging this person.