Choppy: Hat and jacket is very different than hat. How do you know that the main Hapkada there is on the hat, not the jacket? And how does that change the fact that I heard from someone very reliable who heard from his mouth that he never said it’s better to Daven with a hat Bichidus than B’tzibbur without it?
(He didn’t personally write Sh’eilas Rav, did he? It was just someone who asked him questions and recorded the answers, right? Also, that last point is very, very strange. Why would he say you need two covers? There is no source whatsoever in mainstream Halachah for that. The only source I ever found was a Chabadnik who told me he saw it in an obscure Chassidish Sefer from the 19th century. I would love to ask R’ Chaim about that if I ever get the chance.)