if someone were going to meet the president or the vilna goan and he would go in khakis and a polo then it would be understandible correct for him to daven and learn as such. however most people if they would visit the president or the gadol hador would dress in their finest, and chas vishalom without a jacket and tie! so its a bizoyon how these people which is most of the present population can justify going to shul on shabbos in the afternoon or even during the week without a jacket and at least a button down shirt-WERE TALKING ABOUT THE MELECH MALCHEI HAMLACHIM, KING OF ALL KIGS! im not saying im perfect because even though i wear a jacket and hat i dont wear a tie even though i would put on a tie to meet the president
DA LIFNEI MI ATO OMEID- KNOW WHO YOUR STANDING IN FRONT OF!