13 photos show how the Queen has influenced Kate Middleton's fashion choices

For an appearance with the Queen and Camilla, Duchess of Cornwall, Middleton wore a blue coat by M Missoni. The Queen, on the other hand, wore a sky-blue look with a matching hat.

Both Middleton and the Queen wore daffodils, which are a symbol of the royal family's Welsh heritage.

According to "HRH" author Elizabeth Holmes, the Duchess of Cambridge tends to wear both accessories as a sign of respect when she has an appearance with the Queen.

"There isn't a written rule, but I think it's out of respect for the Queen, how she dresses, and the tone that she sets," Holmes said, adding that Middleton will even wear the occasional hairnet for this reason.

For a Diamond Jubilee Thanksgiving service at St. Paul's Cathedral in 2012, the Queen wore a bespoke Angela Kelly outfit in mint green that was designed with embroidered flowers. She also wore a chiffon scarf and a matching hat.

Middleton also chose an outfit with a delicate pattern for the royal engagement. She appeared on the balcony at Buckingham Palace in a lace dress from Alexander McQueen with a hat from Jane Taylor Millinery.

Middleton repeated the same M Missoni tweed coat she wore a few months prior for this appearance with the Queen.

The duchess completed her look with a fascinator, while Queen Elizabeth wore a Stewart Parvin coat and shift dress with a Rachel Trevor-Morgan hat.

For the reception, the Queen wore a sparkly blue dress with her classic Launer handbag.

Middleton also embraced a bold look by recycling a bright-red Alexander McQueen dress. She completed the look with an Anya Hindmarch clutch and black Prada pumps.

To attend the official ceremony celebrating the Queen's 91st birthday, Middleton wore a vibrant Alexander McQueen dress and a Jane Taylor hat. The Queen wore a powder-blue Stewart Parvin outfit and matching Philip Somerville-designed hat.

Queen Elizabeth opted for a blue coat and dress from Stewart Parvin, while Middleton wore an Alexander McQueen dress.

The Queen stood out by pairing her flower dress with a neon-green coat, while Middleton wore a high-neck Erdem dress in a similar print.

Middleton attended the Royal Ascot in a blue Elie Saab dress, which matched the Queen's blue coat and hat.

Queen Elizabeth is rarely seen without a hat, and Middleton's choice in headwear has evolved throughout her years as a royal.

To attend the Christmas Day Church service, Middleton followed Queen Elizabeth's lead by wearing a festive hat with an accent on the left side.

Just like the Queen, Middleton has shown that she's not afraid to stand out at royal engagements by wearing colorful coats. At the 2019 Commonwealth Day service, for example, the duchess wore a bright-red Catherine Walker coat.

In 2015, Queen Elizabeth wore a white, beaded dress with the stunning Belgian Sapphire tiara, a necklace, and earrings.

In 2019, Middleton followed in her footsteps by making a statement at a State Banquet in a sleeveless white Alexander McQueen dress with her Cambridge Lover's Knot tiara, as well as the Queen Mother's sapphire and diamond earrings.

Overall, Queen Elizabeth and Middleton have remained consistent with their style, as Holmes told Insider.

For instance, the Queen has been wearing skirt suits since the 1990s, and Middleton started wearing her signature coatdresses when she became a member of the royal family.

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