Ms Trump accessorised the look with a wide-brimmed boater hat with a large navy-blue band by Hervé Pierre.
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However the look appeared uncomfortably similar to the duchess’ cream-hued ensemble, designed by couturier Anna Valentine, which featured a pair of cream-coloured leather gloves, a clutch bag, and a similar toned hat by Philip Treacy.
“Melania hasn’t taken into consideration that the Duchess of Cornwall nearly always wears either pale colours of cream, certainly in recent years, hence the clash of colours between them at today’s meeting,” Longmore tells The Independent.
“Was there a white memo we didn’t know about? Even Ivanka, Trump’s daughter, was seen at the window in Buckingham Palace wearing the same shade as Melania,” referring to the president’s eldest daughter who is also in attendance at Buckingham Palace with her husband, Jared Kushner.
Longmore notes that while white is an “impractical” colour to wear, Ms Trump may have looked to other members of the royal family for inspiration as to what to wear for the occasion.
The colour, which has become a political symbol in recent years among notable women, was worn by New York congresswoman Alexandria Ocasio-Cortez and representative Ilhan Omar in a symbol of solidarity against the president.
On Sunday, the first lady left the White House in Washington DC for her state visit to the UK wearing a Gucci shirt dress covered in images of landmarks in the British capital, such as Big Ben and the Houses of Parliament.
The vibrant frock had splashes of scarlet, orange and green and featured a collared neckline and a calf-skimming hemline.