The Duke and Duchess of Sussex begin a two-day visit to the country's capital Dublin on Tuesday "at the request of her Majesty's Government" during a testing time for the United Kingdom's relationship with Europe.
Her majesty the Queen was also in attendance dressed as stylishly as she always does in strong bold colours.
But it was the designer behind Meghan's sleeveless, fitted look that stole the show.
"In 1918, my father, King George VI, served alongside one of the Service's founders, Lord Trenchard, before becoming the first of my family to qualify as a Royal Air Force pilot", she noted.
Meghan wore a long-sleeved, full-skirted black Dior dress with a bateau neckline, topped off with a Stephen Jones fascinator.
The Duchess of Cambridge does her usual "Duchess slant". It was certainly a subtle swap behind the scenes as it went completely unnoticed.
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Meghan, Duchess of Sussex joined Prince Harry, Duke of Sussex, Queen Elizabeth, the Duke and Duchess of Cambridge, Prince Charles and Duchess Camilla at the RAF Centenary where they all attended a Royal Air Force Westminster Abbey service.
She accessorised with a simple black Givenchy clutch and Morganite Drop Earrings with Pavé Diamonds by her favourite jewellery brand Birks.
During the final day of their visit, Harry and Meghan met President Higgins and his wife.
Markle's Wickstead dress was one of three outfits the Duchess wore on Tuesday, July 10, in what was an extremely sartorially blessed day for the newlywed. This will include a Gaelic sports festival at Croke Park, the home of the Gaelic Athletic Association. Meetings with The President of Ireland, Michael Higgins, and with The Taoiseach, Leo Varadkar, are both planned.
The Duke and Duchess of Sussex arrived at a summer garden party in Dublin, hosted by Britain's Ambassador to Ireland, Robin Barnett.
Other visits include DogPatch Labs to meet youth learning coding through free workshops.