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Mugler H&M Velvet Peplum Dress ($449)

Not to be dramatic, but we're convinced this is the ultimate cool-girl dress for summer. The velvet peplum style just screams '90s-inspired evening attire, and the piece is so chic, we could imagine any one of our favorite "Sex and the City" characters rocking it around town — though Samantha feels like the clear choice. Style this with tights and a dainty evening bag for a more romantic nighttime look.