I'm wondering what people's impression is of what the historical and current S&P practice(s) is (are) about how to dress on פורים. (The כתר שם טוב doesn't seem to address it.) Personally, I've always preferred the (now rare) custom of wearing לבוש יום טוב (at least to synagogue) over that of wearing silly costumes, but I'm curious about what 'the מנהג' is.