Royal style: 5 times Kate Middleton and Denmark's Princess Mary have dressed identically

Chanel's Karl Lagerfeld once described the style doppelgangers as 'royal sisters'

The Duchess of Cambridge has worn the Emilia Wickstead Kate dress in lilac, olive green and royal blue for appearances dating back to 2017, while Princess Mary wore it in powder blue during a 2015 visit to Tokyo, Japan. Getty Images, Reuters

The Duchess of Cambridge wore a pale pink Beulah London dress to attend the Wimbledon Tennis Championships on July 11, 2021 in London, and Princess Mary wore the same dress in a neutral cream shade to attend the opening of an exhibition at Frederiksborg Castle in Hillerod, Denmark on June 16, 2020. WireImage, Shutterstock

The Duchess of Cambridge and Princess Mary have worn the exact same Beulah London shirt dress. Kate Middleton wore it to visit the Queen Elizabeth Hospital in Norfolk, England on July 5, 2020, and Princess Mary wore it during an official visit to Indonesia on December 4, 2019. Getty Images, EPA

The Duchess of Cambridge wore the Jenny Packham gown in an emerald green shade to attend the Royal Variety Performance on November 18, 2021, while Denmark's Crown Princess Mary chose a champagne hue for a 2022 'Financial Times' photoshoot. Getty Images, Hasse Nielsen

Britain's Duchess of Cambridge is preparing to travel to Denmark this week for a solo overseas visit to the European country.

As well as keeping an eye on Kate Middleton's style during her two-day visit, royal watchers will be looking out for twinning opportunities with Denmark's Crown Princess Mary.

The two are notably similar — they both married into their respective royal families and are in line to be queen consort, and have slim frames, athletic interests and long brown hair.

Not only do the pair look similar, aesthetically, they have been known to twin sartorially in the past, having worn identical dresses by the likes of Beulah London, Jenny Packham and Emilia Wickstead.

Scroll through the gallery above to see the Duchess of Cambridge and Denmark's Crown Princess Mary's twinning style.

Whether its exact replicas, or the same pieces in different colourways, the two royals have complimentary fashion sense, which means the Duchess of Cambridge's trip to Copenhagen looks set to be a style sensation when she steps out with her Australian-born Danish counterpart, Princess Mary.

Whether its for informal engagements, or black tie events that call for formal eveningwear, the two royals have stepped out in very similar outfits.

They are so similar, in fact, that late Chanel designer Karl Lagerfeld once described them as “royal sisters”.

For a photoshoot to accompany a Financial Times profile released earlier this month, Princess Mary wore a champagne-coloured Jenny Packham gown. The Duchess of Cambridge has worn the emerald green version of the same dress on two notable occasions — once during an official visit to Pakistan in 2019 and the second time for a Royal Variety Performance on November 18, 2021.

They have also been known to wear the exact same dresses, styled a little differently, of course. They have each worn blue floral-print shirt dresses by ethical brand, Beulah London. Princess Mary first wore the piece during a visit to Indonesia in December 2019, while the duchess wore the informal piece to visit Queen Elizabeth Hospital in King's Lynn as part of the NHS birthday celebrations on July 5, 2020.

Why do the Duchess of Cambridge and Princess Mary dress so similarly?

There is, of course, no exact answer when it comes to analysing the style crossover between the Duchess of Cambridge and Princess Mary.

The duo don't share a stylist, but they do, in a sense, share a job. While a working royal doesn't have a uniform, there certainly is a dress code that should be adhered to for official engagements, which will explain why the royals, and their stylists, are drawn to conservative but colourful pieces, which are cut below their knees, with shoulders covered, long sleeves and higher necklines.

Look back at the Duchess of Cambridge's most stylish moments here: