Hamptons style map decodes coastal grandmother dressing by neighborhood

White jeans in Southampton and sandy board shorts in Montauk now do more work than any generic “beachy” uniform. The smartest East End dressing is about reading the room, and then the zip code, all of it calibrated to who is shopping, who is dining, and who is trying not to look like they are trying. Marie Claire mapped the area that way, and that is how coastal grandmother now works in the wild.

The East End code is geography first, aesthetic second

Coastal grandmother started as a TikTok-born mood, but in the Hamptons it became something more practical: a dress code with local accents. Lex Nicoleta popularized the trend in spring 2022, and the look quickly spread beyond clothing into home decor and pop culture, with Diane Keaton in *Something’s Gotta Give* becoming the visual shorthand. TODAY tied the trend to Nancy Meyers films, and W Magazine sharpened Nicoleta’s own definition into a phrase that feels almost like a shopping directive: “Martha Stewart-adjacent, not fully Ina Garten...Nancy Meyers chic.”

The look is aspirational, but not loud. It gives you room for polish without costume, which is why Anne Hathaway’s coastal-grandmother photo went viral and why Martha Stewart became part of the conversation as a possible embodiment of the style. The aesthetic also helped spawn a follow-on microtrend, eclectic grandpa; AP connected the offshoot to coastal grandmother.

What actually reads as coastal grandmother now

Forget the oversimplified version built from linen and straw alone. In the Hamptons, the recognizable signals are sharper than that. Marie Claire’s East End map turns on four legible summer pieces: white jeans, striped knits, raffia bags, and sandy board shorts. White denim suggests crispness and control. Striped knitwear leans nautical and intentionally put-together. Raffia keeps the mood light, but still expensive-looking. Sandy board shorts pull the look toward ease and motion.

The Hamptons dress code is “relaxed,” in PORTER’s phrasing, while still favoring preppy, nautical-coded outfits and elevated fabrics, which is the clue that separates a real East End uniform from generic beachwear. The clothes are supposed to look like they belong to a day that might begin with shopping in Sag Harbor and end at an oceanfront dinner, not a day spent disappearing into the sand.

Southampton polish is the most edited version of the look

If you want to understand Southampton, start with restraint. This is where coastal grandmother looks cleaner, sharper, and more financially composed. White jeans matter here because they act like a blank canvas for the rest of the outfit, especially when paired with a striped knit or a crisp top that feels more yacht club than surf shack. The message is not trendiness; it is maintenance, as if every piece has been pressed and chosen for the light.

Southampton style also benefits from its proximity to the kind of spending that prefers understatement. In practice, that means fewer novelty details, fewer overtly casual silhouettes, and more fabrics that hold their shape. Think polished cotton, fine gauge knits, and a bag that reads as woven rather than crafty.

Sag Harbor and East Hampton split the difference

Sag Harbor and East Hampton are where the code gets more social and a little more layered. Sag Harbor’s shopping-to-dinner rhythm encourages clothing that can move from daytime browsing to evening plans without a full change, which is why preppy nautical elements matter so much there.

East Hampton, and especially East Hampton Village, carries more of that elevated, polished energy. The clothes still feel relaxed, but the materials matter. A striped knit looks better when the yarn has weight. A raffia bag works best when it is paired with something tailored enough to keep the whole outfit from sliding into vacation cliché.

Montauk is where the mood loosens

Montauk is the softest edge of the map. Here, sandy board shorts make more sense than pressed white denim, and the overall message shifts from polish to lived-in ease. The look still belongs to the same coastal grandmother family, but it is less about controlled nostalgia and more about movement, salt air, and a wardrobe that can handle wind without losing its shape entirely.

In Montauk, ease reads as status when it is done with restraint. A raffia bag can look casual in theory and expensive in practice, depending on what it is paired with. A striped knit can feel borrowed from a classic East Coast closet rather than bought for the weekend.

How to wear the map without turning it into a costume

The best Hamptons dressing has one clear point of view. If the outfit is Southampton-leaning, keep the line clean: white jeans, a sharp striped knit, and one woven accessory. If the reference is Montauk, soften the silhouette and let the clothes look slightly more weathered, especially in the shorts, knits, and bags. East Hampton and Sag Harbor sit between those poles, which is why they tolerate more preppy detail and more obvious fabric quality.

• Choose one signal piece and let it lead. White jeans and striped knits say polish faster than a pile of obvious accessories.
• Use raffia as texture, not shorthand. It works best when the rest of the look feels intentional.
• Keep board shorts sandy, not sloppy. In Montauk, ease is the point, but structure still matters.
• Lean on elevated fabrics if you want the outfit to read East End rather than generic resortwear.