"Our top selling item for the past four weeks has been our summer sweater," said Anna Lynn O'Leary, manager at C. Wonder in Southampton, a popular shop for beachy, preppy staples that also has a location in East Hampton. "It's a loose-fitting, holey sweater, good for a cool night or to cover up at the beach." The cotton-knit sweater comes in white, olive, orange and blue, so you can find one to match your suit. $98; 48 Main St., East Hampton, 631-324-8513, and 5 Main St., Southampton, 631-287-2645, cwonder.com (Credit: C. Wonder)

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