This summer, when you spot yet another New Yorker vamping around in a pair of perfectly round glasses these are the people you should blame for turning our city into a perpetual Harry Potter lookalike contest: Malian photographer Malick Sidibé, John Lennon and the cast of Hair. At least those are the suspects Eric Wilson IDs in a typically absurdist, slightly loveable Styles section story about why Marc Jacobs, Proenza Schouler, Ralph Lauren, Zegna, Lanvin and others have suddenly started pushing sunglasses your dad thought were cool circa 1968.