before I comment I would like to say that I have been loosely following this thread.
b_h, regarding number 1, the tzibbur is dependent on where you live. Boro park soes not have the same accepted dress as Miami. I’m not saying one is right or wrong, just different.
A question regarding number 2: if someone lives out of “town” and decides for whatever reason to wear a black suit with a black hat on Shabbos, would that be considered dressing as an outcast? for that area it is not the norm.