This year, Halloween falls on a Saturday, which means most of you will take full advantage of the off-duty hours and extend your costume-clad events well beyond the traditional single Allhallows Eve. That said, come Monday, most of you will be forced to toss your once-beloved costume aside—after all, it's not exactly common practice to leave the house dressed in full Halloween regalia on every remaining day of the year. Our solution? Go for a costume that doesn't have to be retired once…