The Duchess of Edinburgh was accused of looking "scruffy" after stepping in for King Charles at a historic event.
Earlier this week, Sophie and Prince Edward represented King Charles by attending the Changing of the Guard at Buckingham Palace.
The couple accompanied France's Gendarmerie's Garde Republicaine to commemorate the 120th anniversary of the Entente Cordiale.
This was the historic diplomatic agreement between Britain and France which laid the groundwork for their collaboration in both world wars.
The Duchess of Edinburgh was criticised over her outfit earlier this week
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The Duchess of Edinburgh and Prince Edward have frequently stepped up to represent the King
Reuters
The King, 75, has currently paused public-facing duties while he receives treatment for a form of cancer, with the Duke and Duchess of Edinburgh consistently stepping up to support the monarchy.
Sophie, 59, wore a Max Mara white coat for the occasion, which she paired with a light blue dress from Roland Mouret.
To accessorise, the duchess carried a Strathberry shoulder bag and donned Prada heels.
Sophie tied her blonde hair into a low bun, keeping some strands out to frame her face.
The Duke and Duchess of Edinburgh represented King Charles at the important parade
PA
Some royal fans were quite critical of the outfit on social media, with one donning the duchess as looking "scruffy".
Another said: "At the very least, button up the coat. Sigh."
A third commented: "Not the outfit for the occasion and that’s unlike Sophie - it all looks a bit last minute.
"The coat should have been done up as they were representing King and Country at a milestone State occasion."
The Duchess of Edinburgh's hair was tied into a low bun
Reuters
Another savage comment included: "I’ll give Sophie my hairdresser’s details as Sophie could definitely benefit from some hair TLC, especially her hair colour."
Someone added: "A two-row coat should not be worn open. The dress is way too long.
"A blazer with the dress would have looked nicer."
A royal watcher posted: "She could really benefit from having quite a few of her dresses and coats made shorter."
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The Duchess of Edinburgh was criticised for not buttoning her coat
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However, other fans loved the outfit, with one writing: "She looked very nice today!
"Hope she wears that dress without a coat at some point so we can see the shoulder bow detail!"
Similarly, someone said: "Another great outfit from Sophie. Very elegant."
A third added: "Very regal during springtime! Beautiful!"