From being rarely seen while dating Prince William, Kate has flourished as a working royal.
Speaking to Express.co.uk, stylist and lecturer at the Fashion Retail Academy in London Anthony McGrath suggested she has been subtly preparing for her future role.
The Duchess of Cambridge has used her changing style choices to show her position in Royal Family.
Anthony said: “As Kate transitioned to her role as the Duchess of Cambridge, her style inevitably evolved.
“Since Kate has been in the limelight she has always been somewhat of a conservative dresser, whether that was because she wanted to prove herself to the Royal Family or was her own personal style, who knows, but she was rarely seen in anything too risqué.
“However, since marrying Prince William and officially becoming a member of the Royal Family, her outfits have certainly become more modest.”
There are some royal style rules that are followed by those in the family.
For example, royal women are reportedly encouraged to wear tights and ditch heels that are too high.
“She also introduced an array of A-lines dresses in various different colours, decorative hats for formal events and closed-toe shoes. Stockings also became a ‘must’ every time she wore an outfit that bared her legs.”
While Kate may show her respect for the Royal Family with well thought out fashion choices, her wardrobe is desired by many.
Items worn by the Duchess will often sell-out quickly and she has managed to build a signature style that is modest yet on-trend.
This has helped the royal show her own style while also preparing for her changing royal status.
Anthony added: “While she now most certainly has a more demure, Duchess-worthy wardrobe, we must give her credit for staying true to who she has and not moulding herself into something else entirely.
“Slowly, but surely, she has refined her style over the years and her style is without a doubt, suitable for a future Queen.”
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How did Kate Middleton become a royal?
Kate Middleton, or Catherine, Duchess of Cambridge, was born on 9 January 1982 at the Royal Berkshire Hospital, Reading, England.
She was born to Michael and Carole Middleton, a former flight dispatcher and air hostess. The couple founded a party supplies company, Party Pieces, in 1987 – now estimated to be worth £30 million.
Kate has a younger sister Pippa Matthews, 34, and a younger brother James Middleton, 31.
Kate and her family moved to Amman, Jordan, in 1984, where the future Duchess was educated at an English-speaking nursery school.
After moving back to Berkshire the family sent Kate to private school, St Andrews School. She went on to briefly study at Downe House before moving onto Marlborough College where she boarded.
For university the young Kate attended the University of St Andrews in Fife, Scotland. Here she was awarded an undergraduate MA (2:1 Hons) in history of art.
Relationship with Prince William
Kate met Prince William when they were both studying at St Andrews, and both living in St Salvator’s Hall. Famously, William reportedly took a fancy to Kate after she wore a see-through dress during a fashion show.
In 2003 the couple began dating and lived together during their second year of university.
The couple split in April 2007, however, in October they were back together.
Prince William proposed to Kate Middleton with his late mother Princess Diana’s engagement ring in October 2010. The couple were holidaying in Kenya at the time.
On 29 April 2011 they married at Westminster Abbey with a whopping 26 million watching the event live.
Kate wore an Alexander McQueen dress worth a reported £250,000 on the big day.
Kate assumed the title “Her Royal Highness The Duchess of Cambridge” and also became the Duchess of Cambridge on the day.