Growing up, Nancy Meyers' movies were my summer style blueprint. Everyone was impeccably dressed in a chic neutral palette, with luxe, lived-in textures. The cotton sweater, summer's alternative to winter's cashmere knits , fit perfectly onto that moodboard. Summer-y cotton sweaters offer the perfect in-between option for transitional mornings or early-summer evenings. They're lightweight and easy to layer, and add warmth without leaving you feeling overheated. Especially at places like J.Crew and Quince , they feel preppy-coded without feeling like they only belong at a country club. Take J.Crew's iconic Rollneck Sweater —it has a slouchy, unisex fit that fashion editors and shoppers have been obsessed with since the '90s. This summer, you can find striped options alongside your usual single-colored fare. I own one in black, but the creamy white option has been on my mind since it appeared in an episode of Hulu's Love Story .…