Start at Carbon, the Woodley Park boutique that Katherine Limon took over in March. She transformed the space into a temple of green, local design and fair-trade goods from around the globe. Highlights include leather bags hand-crafted in Argentina and a new line of men's shoes from Ethiopia, Liberia and Kenya.

Pick up a bike on Calvert Street at Woodley Place and drop it off across the bridge at the intersection of Columbia and Adams Mill roads NW. Walk a few blocks to Mercedes Bien, a vintage store open Saturdays and Sundays with a selection of retro designer dresses, funky belts and racks of men's shirts and jackets.

Return to the same station and ride from there to the Bikeshare station at U and 16th streets NW. Backtrack a couple of blocks to Meeps Vintage Fashionette on 18th and California streets, where you'll find vintage pieces, clothes by local designers and maybe even a creative Halloween costume.

Walk to jewelry and accessories purveyor Legendary Beast, where you'll find silver dangling necklaces and racks of discount earrings. The best part? However much you buy, it will all fit in your backpack.

Head back to U and 16th streets, and ride down 16th Street, turning left on S and dropping your bike at 14th and R streets in the heart of Logan Circle. Walk to Treasury, a vintage store with eco-friendly pieces scattered throughout. Check out the store's stock of cozy cotton T-shirts by Robert P. Miller, made at a century-old Pennsylvania cotton mill.

Pick up a bike at the same spot, and take the bike lane on R Street over to the bike lane on New Hampshire, and drop off at Dupont for a quick stop at Secondi, a consignment boutique where such labels as Marc Jacobs, Prada and Chanel are regular offerings.

From Dupont, ride down New Hampshire Avenue and take M Street NW to the Bikeshare station at the C and O Canal on Wisconsin Avenue just below M Street. No vintage shopping trip in Washington would be complete without a pit stop at Annie Creamcheese, retailer of everything from furs to cardigans to ball gowns.