Sam 2; What about wearing a hat while driving in 90o weather in the Summer? I’ve seen many Choshuve Yidden who drive (the Air conditioned, leased Minivan) up to, and in the mountains without a jacket (Only a tie.) but the hat is ubiquitous, B”H. I go with the Israeli originating crowd, who wear the hat only to Mincha/Maariv in Shul.
