Skip the Marais district in Paris. Forget Bond Street in London. When it comes to shopping in Europe, head east to Kiev, where you’ll find covetable vintage and luxury outposts. Yes, that Kiev, the borscht capital of the world. Really! Take it from model Nadiia Shapoval, who scores her eye-catching duds everywhere from a secondhand bazaar—a secret trove for old-school Armani—to concept stores stocking Comme des Garçons and born-and-bred Ukrainian designers alike. Here, Shapoval’s guide to the secretly fashionable city.