The Duchess donned a navy Alessandra Rich polka dot dress to a D-Day memorial exhibition.
She can also be seen wearing the dress in a portrait the Royal Family took to mark Prince Charles’s 70th birthday.
In May 2019, Kate wore the £1,750 dress again to visit Bletchley Park.
Just like the House of Gucci actress’ dress, Kate’s polka-dotted number featured white cuffs and a collar.
The Duchess style combines a mixture of high-street labels as well as designer.
According to Lucy Ansa-Addo, Director of Laoxa Ltd, Kate has become more “sophisticated” since joining the Royal Family in 2011 after marrying Prince William.
The expert told Express.co.uk: “Kate beautifully rocks high end garments and high street designs from Zara, ASOS and GAP.
But Kate also makes sure she sticks to royal traditions when it comes to choosing her garments, according to Ms Ansa-Addo.
She added: “The Duchess still respectfully follows tradition where possible with her style by wearing pearl earrings for more formal events and engagements.
“However, she knows how to add her own twist depending on the occasion.”
Source: EXPRESS CO UK