Melania donned a white crepe dress with a navy collar and belt by Dolce & Gabbana for the visit with the British royals. But what drew the most attention was her bold hat, which was custom-designed by Herve Pierre, her wardrobe adviser.
The white, wide-brimmed hat with a thick navy stripe appeared to be a clear tribute to Diana, who wore a similar hat for a V-J Day event in 1995. The look was finished with navy Manolo Blahnik pumps.
Diana favored hats, which were considered a signature part of her style during her years as an emissary for the crown.
The Trumps' visit to the United Kingdom is attracting plenty of attention — and generating some controversy.
On Monday, as he was flying in, President Trump attacked London Mayor Sadiq Khan, who has openly criticized the American president previously. Trump called Khan a "stone cold loser who should focus on crime in London, not me."
Then, as he greeted the queen, Trump appeared to fist bump her.
On Monday evening, the royals and the American couple will attend a state banquet together with hundreds of guests, including Princes William and Harry.
One conspicuous absence? Meghan Markle, who remains on maternity leave after giving birth to baby Archie last month.