I find I'm more confident in clothes in comfortable in. Usually I feel more awkward with nicer clothes and fancier grooming.
For me a suit is a lie. That's not who I am and is not something that boosts my confidence.
One thing I disagree on but besides that great article.
We are all comfortable with clothing we feel best in. Doesn't have to be a suit that makes you feel like a million dollar, i am just giving a general example. !! I totally get what you mean ! :)