BaalHabooze
On the rocks
I personally knew of a very choshuv Rosh Yeshiva years ago who would stand by the Beis Medrash door before Shabbos Mincha and send any bochur not wearing a tie back to his dorm room. The “tieless look” is no more than a mishigas and laziness. It is still Shabbos at that time, no reason to dress down.
It sounds as if what I said on my earlier comment is in sync with this Rosh Yeshiva. After all, since when do we observe Availus bFarhesyo on Shabbos? It is unfortunate that some big shots passed away on a Shabbos afternoon, but this is no license to treat Shabbos afternoon casually.
Does this Rosh Yeshiva send Bochurim back to their dorm room, if they are wearing a Bow tie?