Princess Kate has been praised by a style icon for wearing his designs.
Aspinal of London, established in 2002 by British entrepreneur Iain Burton, is renowned for its handbags, which have been seen on the arms of many royal women including Kate.
Kate's most-loved design, the Midi Mayfair, is designed in a timeless vintage style.
Burton expressed his delight, saying: "All of us at Aspinal are hugely honoured and proud that the Royal Family have given their support to Aspinal over the years.
Kate praised by style icon for wearing his designs: 'Everyone in the fashion industry watches what she wears'Getty
Kate carrying the Mayfair bag by Aspinal of London in Bradford in 2020
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"Princess Catherine is one of the most loved, hugely respected and iconic women in the world. Everyone in the fashion industry watches what she wears, and it's reported on fervently worldwide."
The Princess of Wales has carried four bags by Aspinal of London, since debuting her first, an Eaton Clutch, at a friend's wedding in 2011.
Kate's favourite style appears to be the Midi Mayfair, which she debuted in 2018 and has repeatedly worn since.
"The Mayfair is the personification of quintessential refined English elegance, which we believe perfectly suits the princess's style and grace," Burton told The Mail.
Zara Tindall carrying an Aspinal of London bag at the Cheltenham Festival in April
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"The association of Princess Catherine with our Mayfair bag, in particular, has of course given invaluable support to building Aspinal's profile and reputation, as well as benefitting sales of the Mayfair worldwide."
The Midi Mayfair, priced at £595, is crafted from full-grain Italian leather and features Aspinal's signature shield lock and logo. It is available in 26 colours with smooth, textured and patterned finishes.
In addition to her black croc version, Kate owns a now-discontinued lilac colourway, which debuted in 2018.
For both bags, she opts to remove the detachable shoulder strap, instead carrying them by the top handle.
Princess Beatrice and Princess Beatrice carrying the same Aspinal bag to the Christmas carol concert
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Queen Camilla and Zara Tindall are also fond of the Midi Mayfair and have both carried the burgundy croc version.
In March, Zara carried the "Mayfair 2", released in 2023 to celebrate the 10th anniversary of its predecessor.
She carried the £750 black and red ombre croc style at the Cheltenham Festival.
"The Mayfair we hope has become a 'forever' bag; a rare English icon that stands the test of time, surpassing fads, trends and fast fashion, being worn by celebrities time and time again over the years," says Burton.
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Queen Camilla carrying an Aspinal bag to Peterborough Cathedral in 2016
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Zara has an extensive collection of Aspinal bags, including the £550 Ella Crossbody bag, the £350 Raffia Crossbody bag and the £395 Micro Lottie Crossbody bag.
Meanwhile, Princesses Beatrice and Eugenie have both sported the iconic Hat Box in Bordeaux croc on numerous occasions during the festive period.
Queen Camilla's affinity with the brand has remained strong for several years.
She first carried the £450 Letterbox Saddle Bag to a literature festival at Peterborough Cathedral in 2016.
