Muted colours, long dresses and chaste necklines: Meghan has had to tone down her fashion choices since marrying Prince Harry in May but still occasionally displays some of her past style.
It was a question that many asked ahead of the wedding: would the chilled-out Los Angeles actress frequently seen in short skirts and sandals fit into the British royal family mould?
Would the newly-minted Duchess of Sussex imitate the typically English conservative style associated with Kate, the Duchess of Cambridge, wife of her brother-in-law Prince William?
Would Meghan, who turns 37 on Saturday, have to become demure?
"Before the wedding, Meghan cultivated a casual Californian look that was a nod to her LA upbringing," Elizabeth Vollman, who manages the website Meghan's Fashion, told AFP.
"Since becoming a duchess, her style has had to evolve to befit her new royal role and she has dropped the effortless chic look in favour of a tailored and demure style, opting for French designers and neutral shades," she said.
Meghan, who starred in the hit US television legal drama "Suits" before giving up acting, told the website Outnet.com last year that she felt most comfortable in "jeans, cut-offs and flip-flops".
In one of her first public appearances alongside Harry in Toronto in September last year, she wore a pair of ripped jeans and a loose-fitting boyfriend shirt. It was less than a year ago but an age ago in terms of her personal fashion evolution.
- 'Last moment' of joy -
By marrying Queen Elizabeth II's grandson, Meghan has joined the royal family -- an institution whose traditions dominate the lives of its members, including their clothing choices.
"The role she's taken on, it's very austere, it's very sort of serious," fashion designer Stella McCartney, who created Meghan's wedding evening reception dress, told the BBC in a recent interview.
Of the wedding day itself, McCartney said: "I think it was the last moment that she could reflect sort of the other side to her: the joy and the human within her."
Belonging to Britain's House of Windsor means representing the monarchy at closely-watched public events -- where any sign of fashion extravagance is duly noted.
At her first public engagement on May 22, three days after her wedding, Meghan wore a long pale pink dress by Goat, a British designer, along with a hat, a handbag and stockings.
She has shown signs of at least some originality, however.
"Meghan has occasionally pushed the boundaries of the royal dress code," said Vollman, pointing to a "daring" shoulder-baring sleeveless outfit by Carolina Herrera she wore at the Trooping of the Colour military parade in June.
Meghan also frequently wears French designers such as Dior or Givenchy -- a sign that she will not only wear British designers.
"Meghan is more attuned to trends and has more freedom to take fashion risks compared to the Duchess of Cambridge," said Vollman.
"It's exciting following Meghan's style because you can never predict who or what she will wear for an event."
The Daily Mail newspaper said Meghan wore boat neck dresses in order to "respect protocol, while still looking 'a little sexy'."
But the tabloid went on to say that her fashion choices had led to "friction" and were "barely tolerated by royal aides".
Harry himself, the report said, had stepped in to ask her not to wear a tuxedo suit on an upcoming royal visit.
Watching a wheelchair tennis match some months before her wedding to Prince Harry, Meghan Markle's sartorial tastes still owed little to the duchess look which fits the royal family mould
After becoming the Duchess of Sussex, Meghan has been required to bring off a more formal look such as at this service to mark the centenary of the Royal Air Force at Westminster Abbey last month
Formal attire were de rigeur for Prince Charles's 70th birthday garden party at Buckingham Palace in May - but she still manages to push the "boundaries of the royal dress code," says Elizabeth Vollman, who manages the website Meghan's Fashion