The Princess of Wales chose an Emilia Wickstead design for today’s US state visit engagements. 
The Prince and Princess officially welcomed President Donald Trump and First Lady Melania Trump in Windsor, as renovation work continues at Buckingham Palace.
Rebecca English of The Daily Mail shared a brief video.
The Princess of Wales is wearing an Emilia Wickstead dress with a hat by Jane Taylor along with the feather brooch #StateVisit #Trump pic.twitter.com/PwMnHGqCCg
— Rebecca English (@RE_DailyMail) September 17, 2025
The Telegraph has more in this piece by Hannah Furness.
The Prince and Princess of Wales, who had been waiting at nearby Victoria House to meet them, stepped across the grass in the bluster of wind from the propellers.
Prince William took the lead, welcoming Trump with a handshake and engaging them in conversation, stretching an arm out to his wife to draw her in.
More from The Mirror’s coverage.
…heir to the throne William placed a hand on Kate’s back, gesturing for everyone to make their way across the lawn. President Trump then asked the future king about his children, Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7, to which William replied: “They’re well and at school. The new term started a couple of weeks ago.”
The King and Queen then greeted the President and First Lady.
And the four principals moved to the viewing stand. 
More from a British Army/Ministry of Defence post.
The Band of the Household Cavalry performed specially arranged music in State Dress, while 41-gun salutes were fired by The King’s Troop Royal Horse Artillery in Windsor and the Honourable Artillery Company at the Tower of London.
The Prince and Princess.
Another view. 
The Queen, First Lady, and Princess of Wales chatting during today’s ceremony. 
The President and First Lady then joined The King and Queen and The Prince and Princess of Wales in a carriage procession through Windsor Castle’s grounds, escorted by the Household Cavalry Mounted Regiment. 
The Queen and First Lady. 
And the Prince and Princess of Wales.
Lieutenant Colonel Storm Green invited the President to inspect the guard of honor, saying, “Mr President, the guard of honour of the Grenadier Guards, the Coldstream Guards, and the Scots Guards are present and ready for your inspection.”
Rebecca English also shared a video of a lighthearted moment between the King and the President during the inspection as the King warns the President to “watch the sword!”
Funny moment as the King tells President Trump to ‘watch the sword!’ at the end of the Guard of Honour at Windsor Castle. pic.twitter.com/HEUstoEedp
— Rebecca English (@RE_DailyMail) September 17, 2025
There was also a musical performance on the East Lawn of Windsor Castle. 
It included Members of the Royal Air Force Pipes and Drums led by the Band Master of the Band of His Majesty’s Royal Marines Portsmouth (The Royal Band). 
And members of the United States Army Old Guard Fife and Drum Corps.
This was followed by a private lunch and then viewing a Royal Collection exhibit of items related to the United States and the UK in the Green Drawing Room at Windsor Castle.
Embed from Getty Images
The exhibit was attended by the King, Queen, President, First Lady, Prince and Princess of Wales, and the Duke and Duchess of Gloucester.
Embed from Getty Images
The Prince and Princess of Wales with US Secretary of State Marco Rubio. 
Now for a quick look at some of today’s fashion. The Queen repeated a Fiona Clare ensemble in cobalt blue, with a Philip Treacy hat and the Russian Sapphire Cluster Brooch. Mrs Trump was in a dark grey military-style suit and hat by Christian Dior.
We now move to our review of what Kate wore. 
The Emilia Wickstead design offers a familiar silhouette to those following the Princess’s style, with similarities to the label’s Chaney Dress ($2850), an A-line design with a fitted bodice and a full, pleated skirt. The Princess eliminated the thin belt and the lowest row of buttons, opting for a wider waistband. The lapels are also different, with the off-the-rack version featuring notched lapels while the Princess chose peaked and curvier lapels. The ready-to-wear version of the dress is crafted of 95% polyester and 5% elastane; my guess is that the Princess’s dress is made from that same fabric. 
Upon initial views of the Princess, some thought she was repeating the Emilia Wickstead design seen during the South Africa state visit in 2022, but you can see the differences between the two garments.
The Princess wore Queen Alexandra’s Three-Feather Brooch, shown below (left to right) as seen during the South Africa state visit in 2022, when it was worn with the detachable emerald drop, on Commonwealth Day in 2023, and again today. 
We saw the return of the Princess’s ruby and diamond earrings, along with a necklace that wasn’t visible in any of the photos I have found. I bet it is the same pendant worn with these earrings for VE Day 80th anniversary celebrations in May, as shown in the two photos on the right in this montage.
For more on today’s jewelry, be sure to visit The Court Jeweller.
The Princess accessorized with her Chanel Boy Flap Bag with Enamel Handle in burgundy quilted calfskin with a decorative enamel and brass handle.
We saw a new hat today by Jane Taylor London, the milliner’s Neso Style ($2710) in luxury felt with a satin bow and veiling. The description notes that the hat is “Securely attached with a comb and discreet hair-coloured elastic…”. 
The Princess sported what looks like a new pair of Gianvito 105’s in Chocolate Brown Suede, a point toe style with a 4″ stiletto heel.
I’ll see you shortly for coverage of tonight’s state banquet. Here is a quick video of the King and Queen looking at preps for the gala dinner.
🇬🇧 🇺🇸 The King and Queen inspect the banquet table in St George’s Hall ahead of this evening’s State Banquet pic.twitter.com/T5OJm7MY3C
— The Royal Family (@RoyalFamily) September 17, 2025
Lulu
Sunday 21st of September 2025
I'd like to know how either of those ladies is able to walk so gracefully across a grass field in such heels!
Sue W
Sunday 21st of September 2025
@Lulu, I'm so glad I wasn't the only one thinking this! 😂 I wonder if they have clear plastic covers over the tips of the heels to widen them? Or did they just walk on top toe? Does anyone have any ideas? Walking on gravel in heels is tricky but doable, but on grass/soft sod it's nearly impossible and they make it look effortless. Is it a trick accomplished by clever accessories or just total skill?
Shannon
Friday 19th of September 2025
Love the coat with chic accessories,my only dislike i would have preferred a oxblood shade in shoes
Lulu
Friday 19th of September 2025
It's the same piece she wore before. She just added buttons.
Sue W
Friday 19th of September 2025
While all three ladies looked lovely and appropriate, the Queen stole the show for me. The details on her cuffs and along the front lines of the dress are echoed somewhat in her gloves and the pattern of her handbag. I think the details would make it feel lovely to wear and to see in person. Also, that bright blue color looks stunning with her white hair and complexion.
While Mrs. Trump's suit is beautiful, I agree with others it is a bit severe for the occasion. The purple hat gave me some pause - perhaps she was trying to lighten the overall feel of the outfit, but without any hint of purple anywhere else (or grey on the hat itself), it comes off looking unintentional and odd. I don't mind the size of the hat - unique to be sure, and somewhat reminiscent of armor, but if I had crowds following me everywhere, I might want a little armor too. Hopefully she was able to remove it for closer conversation later in the visit.
The Princess is lovely as ever. It is a safe outfit for sure - but there is a beauty to "safe" as well. That bag added a little pop of awesome!
Samantha
Thursday 18th of September 2025
Once again, the state occasion uniform has made its elegant appearance on the world stage. The coatdress—immaculately tailored and perfectly in step with current fashion trends in both colour and length—embodies a sense of refined tradition. It’s sensible, conservative, and yes… very, very, very safe. But safe can be sophisticated.
The hat, with its delicate netting framing Catherine’s face, adds just the right dash of whimsy—a nod to frivolity in an otherwise formal ensemble. Paired with sleek stilettos, the overall look is timeless, destined to remain stylish even decades from now.
As for the British autumn, it seems the chill has truly set in. William’s overcoat was a subtle but telling sign that temperatures have dipped. One can only imagine how brisk the air must have been.
It does raise the question: how many more coatdresses will we see, and how might they evolve in styling? There’s a treasure trove of designer suits currently gracing the fashion landscape—pieces that could elevate the silhouette while preserving the formality and enduring elegance expected of Catherines royal attire.