If the new barter economy means that you can trade a Dries Van Noten winter coat for last summer’s Marni sandals, things can’t be that bad. ReFashioner, a new invitation-only Web site, lets you swap your unwanted designer and vintage clothes for other couture castoffs. Kate Sekules, a New York writer, editor and Comme des Garçons addict, said the site was created for women who love “good designers and good design — and who like turnover.” No money is exchanged, though a $5 fee is charged per trade. And while you wait to receive an invite from Anna Wintour, you can window-shop at .