“The purpose of the the hat and jacket is “lo shinu es malbushayhen” – we want to dress differently than the seculars. “
That doesn’t cut the mustard, Joseph. The goyim ALL dressed that way (AL CAPONE dressed that way!) in the early to mid part of the twentieth century. Watch any film noir, and you will see fedoras, black suits, white shirts and ties. It has zero to do with “lo shinu…” And today, ALL businessmen dress this way. That’s why the honchos are referred to as “the suits.”