yid.period:
And the story about the fellow walking to shul does not prove anything. If someone has the custom to wear a black hat on shabbos and neglects that minhag due to the heat, then he is essentially neglecting what he has deemed kavod shabbas because of the heat. That’s not difficult to accept.
Obviously R S felt that it is an honor to Shabbos to wear an hat. (If a guy decides to “honor” Shabbos through wearing a pink left sock with his pant tucked in it, do we think that RJBS would have told him off when he neglected to do so?)