When a couple has been together a long time, no one thinks about what came before or how the future might unfurl-it's all just a perfect combination of two wonderfully independent parts. Romantic? Yes, but there's always been a sweetness and nostalgic vibe to both Hampden shops Sixteen Tons, with its urban lumberjack/Jack Kerouac thing, and Doubledutch, with styles always poised to bake a pie, ride a bike, or slow-dance to a ragtime band. Now sharing two floors-she's on top, natch-of the Avenue's most attractive address (those front display windows!), 16T and DD sell handsome men's wear and pretty girl finds with a fresh, modern vintage feel. Congrats!