The custom of dressing up in costumes on Purim originated from Ashkenazic communities in Europe and has become a popular custom today for Ashkenazim (cf. Rema in Shulkhan Aruch Orach Chaim 696:8). ...
Many observant sephardim in Israel, especially those in yeshivot, dress in black and white. Does anyone know how this happened? There is no tradition of Jews in North Africa or in the Middle East ...