Kendall Jenner’s current street style in the South of France is the definition of chic. Stepping off a yacht—as one does in Cannes, naturally—Ms. Jenner’s monochromatic ensemble is both totally retro and modern at the same time. To cop her glamorous look, a pair of ’50s cat-eye sunglasses is essential. Next you’ll need a demure tailored jumpsuit paired with barely-there nude sandals. Finish with Kardashian-worthy diamond stud earrings and a little wind in the hair—et voilà—you’ve got riviera style on lock.