The OP isn’t suggesting that B’nei Torah should wear jeans and a t-shirt. He mentions “well dressed men”. Well dressed men nowadays (think CEO’s, lawyers, businessmen, etc) dress respectably but don’t wear hats. The president doesn’t wear a hat. Many MO people obviously hold of this as they will come to shul dressed respectably but without a hat. The question is why Yeshivish people still do this.
