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    Princess Diana's Wedding Dress Designer Stored a Secret "Sister Dress" of One Famous Design at Hampton Court Palace

    The dress is up for auction in the largest Diana fashion sale ever.

    Kristin Contino's avatar
    By Kristin Contino
    Published 9 June 2025 In News

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    Princess Diana and Prince Charles wearing a tux and black gown next to a photo of a black sequined dress on a mannequin
    (Image credit: Getty Images)
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    Elizabeth and David Emanuel catapulted to fashion stardom when they designed Princess Diana's royal wedding dress in 1981, but earlier the same year, they created another gown that put Lady Diana Spencer on the map. When Lady Diana Spencer made her first official appearance with her future husband, Prince Charles, she turned to the then-husband/wife team of the Emanuels to design a show-stopping evening dress, but it turns out a second black silk taffeta gown was created from the same material.

    The shimmery ruffle-trimmed gown, known as the "Sister Dress," is now up for auction in the Julien's Auctions's Princess Diana's Style & A Royal Collection event. More than 300 pieces of royal fashion and memorabilia will be up for sale, including Diana's iconic "Caring Dress" and a rare letter she wrote to a footman at Buckingham Palace.

    Elizabeth Emanuel attended a London press preview for the auction, which will be held in Beverly Hills on June 26, and she opened up to GB News about the second creation that Diana never wore. "I called it the Sister Dress because it came from the same bolt of fabric," she told the outlet. "Diana tried it on. We were considering this, and others—some black with gold sequins—but we kept coming back to this one."

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    Princess Diana wearing a black strapless gown walking down a staircase with Prince Charles

    Princess Diana wore a black gown by David and Elizabeth Emanuel for her first official royal appearance in March 1981.

    (Image credit: Getty Images)

    A black sequin dress on a mannequin at a Princess Diana auction

    The "Sister Dress" is seen on display at a press event for an upcoming Princess Diana fashion auction.

    (Image credit: Getty Images)

    While the "Sister Dress" is covered in sequins and features a v-neck trimmed with ruffles, Diana ultimately decided to go with a sexier, strapless version cut from the same black fabric.

    The designer explained that she wanted to give Diana a more grown-up look than the "romantic, pastel, frothy dresses" she'd been wearing. "We thought this contrast would create a buzz, though we had no idea just how much," Emanuel said. "That black dress marked the transformation. She became a dazzling starlet in the making. From that moment on, she was a fashion icon."

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    Emanuel has kept the dress in storage at Hampton Court Palace with her archive of designs. "It’s in amazing condition because it’s never seen sunlight," she told GB News. "It’s exactly the same fabric as the original, made by the same seamstress, Nina. All the workmanship is there. From a historical perspective, it’s really important."

    Elizabeth Emanuel arranging the skirt of Princess Diana's black gown at an exhibit

    Elizabeth Emanuel is seen arranging the skirt of Diana's dress during an auction in 2010.

    (Image credit: Getty Images)

    The "Sister Dress" is expected to fetch between $20,000 to $40,000 in the Julien's Auctions event, and a swatch of material and some rare sketches are also up for sale amongst the hundreds of other Diana items in the auction.

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    "These dresses are memories," Emanuel said. "They’re part of my life. But I thought it would be nice to bring them out of the darkness—especially for people who loved Diana and everything she represented."

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    Diana
    Kristin Contino
    Kristin Contino
    Senior Royal and Celebrity Editor

    Kristin Contino is Marie Claire's Senior Royal and Celebrity editor. She's been covering royalty since 2018—including major moments such as the Platinum Jubilee, Queen Elizabeth II’s death and King Charles III's coronation—and places a particular focus on the British Royal Family's style and what it means.

    Prior to working at Marie Claire, she wrote about celebrity and royal fashion at Page Six Style and covered royalty from around the world as chief reporter at Royal Central. Kristin has provided expert commentary for outlets including the BBC, Sky News, US Weekly, the Today Show and many others.

    Kristin is also the published author of two novels, “The Legacy of Us” and “A House Full of Windsor.” She's passionate about travel, history, horses, and learning everything she can about her favorite city in the world, London.

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