With its Breton stripes and classic crew-neck cut, A.P.C.'s navy and cream striped cotton sweatshirt gives collegiate cool a preppy update. Team it with a mini skirt and ladylike pumps for a laid-back daytime look. Shown here with a Jerome Dreyfuss bag, A.P.C. skirt, Isabel Marant shoes and a Giles & Brother necklace and bracelet.