According to royal reporters, the recommendation is not COVID related.
The 'Harry Potter' star wore an up-cycled bridal look to attend the Earthshot Prize Awards.
The Duke and Duchess of Cambridge wore recycled formal wear for the occasion, which celebrated green activism.
The pop star met the royals at the 'No Time to Die' premiere earlier this month.
The event was originally scheduled to take place during the unveiling of the statue in Diana's memory this past summer.
The 'No Time to Die' cast was seated in the royal box at the Royal Albert Hall premiere.
He spoke to the duchess at the 2019 BAFTAs.
The 'No Time to Die' star recently spoke with the royals at the world premiere of the James Bond film.
While presiding over the opening of the Scottish parliament Saturday, the Queen recalled the memories she and Philip made in Scotland.
Beatrice welcomed her first child last month.
Prince William and Kate MIddleton held snakes and spiders during a visit to Ulster University in Northern Ireland on Wednesday.
The couple also sampled local whiskey and listened to some music.
Prince Charles and Camilla Parker Bowles were also in attendance at the star-studded London world premiere of 'No Time to Die.'
The Duke and Duchess of Sussex attended the New York City event on Saturday.
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