Sylvie Millstein, the face behind the emerging label Hellessy, knows a thing or two about uncomplicated elegance. After honing her fashion cred at Givenchy and Chanel, the Japanese-French designer set out on her own in 2012. Her mission? To dress women in pieces that embody that certain je ne sais quoi—relaxed yet refined, nonchalant yet impeccably constructed. Looking to New York’s rooftop parties for inspiration, her latest collection embodies the spirit of a summer in the city. Blue, ivory, and blush hues mimic sunsets casting their light over a dazzling skyline, as fluid cotton-linen gowns, pajama separates, and easy wide-leg trousers are testaments to restrained elegance. Elsewhere, a V-neck lamé shift nods to Art Deco skyscrapers and vertical stripes recall soaring towers. Though the offerings swerve more in the casual-cool direction, they’re still imbued with Millstein’s signature sophistication.