Kate Middleton's Coronation Dress Mystery — Why Did It Look Different Under Her Robe Vs. in Portrait?

When King Charles' official coronation portraits were revealed, fans got a better look at the Princess of Wales' gown...and noticed something was different

Andy Stenning  - WPA Pool/Getty Images Kate Middleton, the Princess of Wales on May 6, 2023
Andy Stenning - WPA Pool/Getty Images Kate Middleton, the Princess of Wales on May 6, 2023

When King Charles and Queen Camilla's coronation portraits were released, royal watchers got a better look at Kate Middleton's gown for the historic day — and many were left with questions.

Like several other members of the royal family, the Princess of Wales wore a robe to the crowning ceremony at Westminster Abbey on May 6. It wasn't until Monday when the official portraits were unveiled that fans got to see her dress by Alexander McQueen (the designer also behind her 2011 wedding gown) — an ivory silk crepe with silver bullion and thread work embroidery featuring rose, thistle, daffodil and shamrock motifs representing the U.K.'s four nations.

However, some were quick to point out that the neckline of the dress looked very different than the one under the robe. While Princess Kate, 41, had a deep V-neck in the portrait — showing off Queen Elizabeth's George VI Festoon Necklace — her dress during the day had a much higher neckline.

Related:How Kate Middleton and Queen Camilla 'Together' Planned Their Coronation Looks (Exclusive)

Theories emerged on social media, including speculation that Princess Kate wore a different dress for the coronation ceremony than for the portraits that took place afterward at Buckingham Palace. Some even believed that Kate wore the dress backward for the Westminster Abbey service.

Sky News commentator Alastair Bruce shared another explanation on Twitter: Kate wore a "temporary cape" over her dress to protect it from the robe and chains.

Dan Charity - WPA Pool/Getty Images Prince William and Kate Middleton
Dan Charity - WPA Pool/Getty Images Prince William and Kate Middleton

A cape would have been similar to what Princess Charlotte wore for her grandfather's historic day. The 8-year-old royal matched her mom in an Alexander McQueen dress and cape with ivory satin stitch embroidery featuring rose, thistle, daffodil and shamrock motifs.

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Princess Kate wore her late mother-in-law Princess Diana's South Sea Pearl Earrings and topped her ensemble with a bespoke Jess Collett x Alexander McQueen headpiece with silver bullion, crystal and silver thread work three-dimensional leaf embroidery — and Princess Charlotte wore a mini version of the headpiece!

Leon Neal/Getty Princess Charlotte, Kate Middleton, Prince Louis and Prince William
Leon Neal/Getty Princess Charlotte, Kate Middleton, Prince Louis and Prince William

Related:How King Charles' 70-Year Wait Prepared Him for the Throne 'Better Than Any Previous Monarch'

Seeing the Princess of Wales without her Dame Grand Cross of the Royal Victorian Order robe also prompted speculation that she took inspiration for her coronation dress from a previous outfit in her closet. For the 2019 Diplomatic Corps reception, the royal sported a gown featuring a similar neckline and long sleeves — also by Alexander McQueen.

For the 2019 event, Princess Kate completed her look with statement earrings, the Nizam of Hyderabad necklace and Queen Mary's Lover's Knot Tiara.

For both the coronation and the Diplomatic Corps receptions, Kate wore a blue sash — indicating her status as a member of the Royal Victorian Order — and a yellow ribbon — a Royal Family Order.

Victoria Jones - WPA Pool/Getty Kate Middleton
Victoria Jones - WPA Pool/Getty Kate Middleton

Royal embroiderer Chloe Savage tells PEOPLE that Princess Kate and Queen Camilla were both involved in the planning of their coronation outfits, making sure they perfectly coordinated for the big day.

"If you noted, all the girls wore floral themes," Savage says, pointing to the motifs on Kate's dress as well as the trains of Camilla's robes.

Related:Sophie, the Duchess of Edinburgh's Coronation Outfit Was 'Iconic in a Quiet Way,' Says Designer (Exclusive)

The Queen's sister Annabel Elliot and friend Fiona Mary Petty-Fitzmaurice stepped into the spotlight to support her as Queen's Companions, a modern spin on Queen Elizabeth's six maids of honor from her 1953 crowning. Annabel and Fiona, who is also known as Lady Landsdowne, wore the same shade of white as the Queen and Princess Charlotte.

Phil Noble - WPA Pool/Getty Prince William and Kate Middleton
Phil Noble - WPA Pool/Getty Prince William and Kate Middleton

"If you get to look at it, you can look at the maids of honor and the Queen and Charlotte, they're all in the same," Savage points of the matching fashion. "I suspect it's a bolt of fabric. I suspect they bought one specific bolt, and it's all from the same because they're absolutely dead matching. There's no way that's by accident."

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