The theme for this bi-level, classic shingle-style boutique is “Parisian summer fantasy,” with manicured gardens and Chanel’s timelessly elegant design codes: contrasting black and white, interlocking C motifs and polished accents that echo Mademoiselle Chanel’s apartment on rue Cambon. Besides the iconic tweeds and handbags, the location carries enough evening wear for a season full of galas. Also look for the coveted Coco Beach collection, with its ’90s-inspired swimsuits and mini-dresses.

Across the street from Louis Vuitton, this TikTok-worthy boutique is decked out in blue-and-white stripes, reminiscent of a beach towel. It feels like stepping into summer. So do the beachy items on display, like bucket hats, pool slides, and crochet tote bags—all prime examples of quiet luxury, with neutral, color-blocked tones and timeless silhouettes

Just in time for kaftan season is this haven of elevated resort wear, peddling straw hats, sandals, beach cover-ups, swimwear and breezy dresses for leisurely days in the sun. It carries its own line, along with a selection from resort designers such as Melissa Odabash and Carmen Sol.

A summery white Moke serves as shuttle from anywhere in East Hampton to Louis Vuitton’s sprawling new boutique, featuring a gallery-worthy lantern installation and decor inspired by an idealized version of its seaside surrounds: beach chairs, surfboard, hammocks, and some banana palms thrown in for good measure. It carries the LV by the Pool collection, with luxurious beach attire and monogrammed mules, but the most coveted item may be a limited-edition Neverfull bag that says “Hamptons” on it.

This two-floor boutique prominently features the Escape collection, whose bold archival prints, like a rainbow loop or retro crepe de chine, and easy-to-wear summer staples. For men, there are T-shirts, Bermuda shorts, shirts and sweaters; for women, expect a wide selection of dresses, kaftans, swimwear and stylish sets designed for head-to-toe coordination. The 1970s-style headscarves and the mini bucket bags make especially covetable purchases.

Visit any high-end resort town around the world—Saint-Tropez, Capri, Honolulu, Palm Beach—and you’re bound to spot a Zimmermann boutique or a stylish woman wearing its refined resort wear. The Australian brand now has two locations out east: one on Newton Lane in East Hampton and one in Southampton, both carrying its signature romantic florals and showstopping dresses for formal summer events. It also has some of the most elegant swimwear around, with embellishments and flattering cuts.

If you’re in the market for a coordinating linen set or a breezy dress that will translate from day to night, this is the spot. Bonus: Most pieces retail for less than $300, and the shop offers an extended range of sizes.

The rapidly-expanding Derek Lam 10 Crosby label has just planted its first Hamptons flag, where the self-described “intergenerational” edit includes a specialty denim bar that features a large range of shades and silhouettes, from skirts to shorts to wide-leg jeans. Here you can find something to wear back to the city—be it a crisp white shirt or a tailored midi dress.

Just down the street from the new Sant Ambroeus restaurant is this Italian menswear powerhouse, which is launching an exclusive capsule collection in collaboration with Mr. Porter. Shoppers can expect a modern take on the heritage brand’s signature design codes, with sharp tailoring and timeless, versatile pieces.

Donna Karan’s Sag Harbor boutique is tucked in the back of one of the area’s buzziest restaurants, Tutto Il Giorno. It spotlights the work of African artisans as part of the designer’s efforts to provide a platform for emerging talent. Pick up a unique safari-inspired jacket in a soft summer suede or a floaty, hand-dyed Indian silk slip dress—the whole space feels more like a private lounge than a shop.