Die-hard vintage hounds know that this fair comes but twice a year to NY, mark their calendars for it long in advance, and stand in line before doors open. Both local boutiques (like No. 6) and upstate and out-of-state sellers set up booths to hawk their findings. Don’t anticipate finding any bargains here, but you won’t waste your time digging through moth-eaten sweaters and ratty polyester nightgowns, either. Expect top-quality stuff from all decades and all degrees of dress.