There's this assumption of "universal reference" in social signals, so for me to be told that "wearing a suit puts you in a different frame of mind", as in one which makes you work/feel better about yourself is completely wrong...in the sense of what frame of mind it puts you in.
For me, a suit is the uniform of the con-man, the salesman, the fraud, the bludger, the twit. You put on a suit because you want to fool people who can't think rationally and they're incapable of making judgments except by what you look like through signals of conspicuous consumption.
Imagine being constantly told that you should dress in a uniform with such connotations to make yourself psychologically feel better/superior (especially compared to clothes that you have yourself chosen because they do make you feel better).
Actually, it makes me feel like I'm talking to a sales person. It is as if dressing up is used to conceal something about the intentions or shortcomings of the person. I probably don't explain it in the right way, but that is more or less the feeling it evokes.