Reply To: Coming to shul without a jacket for davening Shachris

You should dress for the RBS”O three times a day the same way you’d dress for the RBS”O if you were meeting Him for a once-in-a-lifetime one-on-one meeting He called you to (during your lifetime), where you’d be having a back and forth conversation with Him on how you should teach Torah to Klal Yisroel.