ujm, we have apparently one case of mass execution by Shimon b’ Shetach in history (who lived in generally very bloody and desperate times) v. opinions in Makkos that executing one person in 70 years makes a bloody court. So, how do we weigh inappropriate dresses v. other problems Sanhedrin will be dealing with – say, murderers, informers, communists, idol worshippers, pandemic rule breakers?
I expect a Rabbi Akivesque Sanhedrin member to argus this defense: as to the extent (pardon the word) of the problem in Israel – we do have some reasonable segregation in Israel, so that a charedi man from Bnei Brak needs to go out if his way to Tel Aviv to complain about attire. So, for one this is going to impeach the witnesses – either they are not shomer shabbat or they travelled to Tel Aviv l’dvar aveira, all dressed in black etc.