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New York-based fashion designer Samantha Sleeper recently signed on as curatorial director of Purely Fashion. The Chicago-based app allows users to locate designer merchandise and check out runway snaps and look books, so anyone on the Purely team knows a thing or two about style.

We asked Sleeper which Chicago shops land on her "best of the best" list. Here are her picks, which offer everything from investment pieces to party dresses and all-natural apothecary goods.