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    1. Fashion
    2. Celebrity Style

    Flip-Flops and Sweatpants Will Be the 2025 Hamptons Girl Uniform, According to Mary-Kate Olsen

    The Row's enigmatic founder made a rare appearance in an even more unexpected outfit.

    Halie LeSavage#039;s avatar
    By Halie LeSavage
    Published 1 July 2025 In News

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    Mary-Kate Olsen walks in the Hamptons wearing a graphic t-shirt with sweatpants and flip flops
    (Image credit: Matt Agudo/INSTARimages.com)
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    On a July 1 walk through the Hamptons, Mary-Kate Olsen asked me to reconsider everything I thought I knew about the elite vacation destination's dress code.

    When I think of the Hamptons, I envision Jennifer Lopez riding her bike in vintage Chanel, Jennifer Lopez staging a Ralph Lauren photoshoot in the lavender fields, or Jennifer Lopez shutting down a LoveShackFancy to shop. In other words, I imagine all-out opulence through a fisherman aesthetic filter. Flip-flops and sweatpants aren't anywhere on my radar; they're far too casual for what I expect from A-listers' favorite East Coast enclave. And yet, that's exactly what The Row's co-founder chose to wear for her first sighting of the summer.

    Mary Kate Olsen walks in the Hamptons wearing sweatpants a tshirt and flip flops

    Mary-Kate Olsen arrived in the Hamptons on July 1 in a decidedly anti-Hamptons outfit.

    (Image credit: Matt Agudo/INSTARimages.com)

    Olsen took her afternoon stroll in an uncharacteristically high-low outfit—one that reformatted her label's flip-flops and jeans outfit formula into an even more relaxed font. She swapped The Row's low-rise baggy jeans for Free City sweatpants (currently retailing for $168 at Anthropologie) and slipped on a vintage T-shirt advertising another celebrity hotspot (LA). Her sandals came directly from her label's own catalog: from the looks of it, they're The Row's $890 City flip-flops. A vintage baseball cap and sunglasses shaded her face.

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    Mary-Kate Olsen's angle on the sidewalk made it difficult to discern which of The Row's It-bags were perched on her shoulder. From the looks of it, she toted her coastal essentials in a creamy rendition of the Park Tote bag. The same hand also clutched a brown paper bag—no doubt filled with a bagel or sandwich from one of the neighborhood's cult-beloved bakeries.

    Maybe Mary Kate-Olsen's flip-flops and sweatpants are a hard-left turn away from the sardine prints and cable-knit sweaters otherwise associated with a beachside retreat. But they're also an OOO variation of the laid-back luxury aesthetic she's championed since opening her cult-beloved label in 2006. Mary-Kate Olsen loves an oversize layer and a neutral-on-neutral outfit even more. Technically, navy sweatpants and black flip-flops fit the bill.

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    Marie Claire Newsletter

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    Halie LeSavage
    Halie LeSavage
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    Senior Fashion News Editor

    Halie LeSavage is the senior fashion news editor at Marie Claire, leading coverage of runway trends, emerging brands, style-meets-culture analysis, and celebrity style (especially Taylor Swift's). Her reporting ranges from profiles of beloved stylists, to exclusive red carpet interviews in her column, The Close-Up, to The A-List Edit, a newsletter where she tests celeb-approved trends IRL.

    Halie has reported on style for eight years. Previously, she held fashion editor roles at Glamour, Morning Brew, and Harper’s Bazaar. She has been cited as a fashion expert in The Cut, CNN, Puck, Reuters, and more. In 2022, she earned the Hearst Spotlight Award for excellence in journalism. She holds a bachelor’s degree in English from Harvard College. For more, check out her Substack, Reliable Narrator.

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