Emoticon613, you are right the external influences the internal.
But having a bar mitzvah boy dressed as a Rebbe can have direct negative effects on him. He will look down on those not dressed likewise. He will disdain his secular high school studies. I have even seen such dress affect Kibud Av.
“dressing like a talmid chacham can make it easier for us to get there.”
In many cases it can come to make you think you are already there.