We Brits have an expression for that: "Suited & booted." You do make a good point though, confidence comes from the gravitas presented in appearance. Beware though, the suit and tie is the uniform of the professional, it doesn't mean that they are any better, or in some cases, any good at all.
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When I go casual I often wear one of the many Aloha shirts that my wife has made for me.
The fabric of this shirt isn't of an Hawaiian theme, it depicts the golden age of travel.
Using some of the offcuts my wife made the bow tie that I am wearing.
Bow tie, straw hat, striped blazer, that's casual enough for me, thank you very much.