Kate Middleton gives a romantic nod to Prince William as she re-wears this 2010 outfit

The Duchess of Cambridge is showing off her sustainable side by re-wearing a blouse that's almost a decade old.

• During an event close to Kate's heart, she wore a blouse with a significant meaning behind it.
• The Whistles blouse is a modern twist on Victorian-era fashion, which has been coming back this season.
• In other royal news, the Duchess of Cambridge stuns in red as she steps out in London to promote photography book launch.

This month, Kate has been showing off her fashion influencer status, including proving that the skinny jeans trend is not over. Well, now, about a week after celebrating her 10th wedding anniversary with Prince William, the Duchess of Cambridge is showcasing her more sustainable side. During a phone call with finalists from her Hold Still photography competition, she re-wore the same cream Whistles blouse from her 2010 engagement photos.

In the photos, you can also see that Kate paired the blouse with her famous pearl earrings from the Queen.

According to a fan on Twitter, the blouse is also a favorite of Pippa Middleton, who has been seen wearing the same style blouse.

This isn't the first time that the Duchess has donned the same outfit twice. In fact,  she's showing off other favorites, including her favorite brown riding boots, to complete an outdoor chic outfit during her big anniversary plans with the family.

While the blouse from Whistles is sold out, the brand still has similar styles that you can shop if you're looking to incorporate some royal-approved looks into your outfit.

$179 at whistles.com

Whistles White Oversized Collar Detail Top, $179/£89

Add some texture and detail to your outfit with a delicate Victorian-inspired blouse. The frilled collar will create a more elegant look perfect for dressing up or wearing casually. The balloon sleeves are also perfect for ventilation and breathability, especially as the weather warms up.

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$219 at whistles.com

Whistles Lace Collared Cotton Blouse, $219/£109

Look whimsical in a vintage-inspired blouse featuring a lace collar and flowy sleeves. The ivory shade is ideal for pairing with trousers or jeans, and the cuffed wrists also feature a button to fasten with.

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What is Hold Still?

This photography project was launched by Kate last year to encourage people in the U.K. to photograph their experiences during the COVID-19 pandemic. The project is in collaboration with the National Portrait Gallery and is even being turned into a book, which will be titled "Hold Still: A Portrait of Our Nation in 2020." The book will feature 100 photos with accompanying stories and a forward from the Duchess herself. 

The National Portrait Gallery posted about the launch on its official Twitter page, captioning it, "The Gallery is set to publish a new book of photographic portraits from the Hold Still exhibition. Launching on the 7 May 2021, its publication will mark one year since HRH The Duchess of Cambridge and the Gallery launched the ambitious community project."