SANDRINGHAM, UNITED KINGDOM - JANUARY 03: Prince Charles, Prince Harry And Princess Diana Holding Hands As They Arrive For A Photocall At Sandringham. She Is Wearing Cashmere And Wool Coat With Synthetic Beaver Fur By Fashon Designer Arabella Pollen And A Fake Fur Hat By Milliner Gilly Forge. Prince Harry's Coat Designed By Fashion Designer Catherine Walker (Photo by Tim Graham Photo Library via Getty Images)
(Image credit: Tim Graham Photo Library via Get)

Princess Diana made a rebellion against Prince Charles' 'ego' with her shoe choices after their marriage crumbled, a royal fashion expert has claimed. 

According to a new royal book, The Lady Di Look Book: What Diana Was Trying to Tell Us Through Her Clothes, a fashion expert has told of how the late Princess would refuse to wear heels that would make her much taller than Prince Charles, in a bid to not dent his 'ego'.

19th August 1981: Charles, Prince of Wales, and Diana, Princess of Wales, (1961 - 1997) in the grounds of Balmoral Castle, Scotland whilst on their honeymoon. (Photo by Central Press/Getty Images)

Credit: Getty Images

Eloise Moran, who penned the release, explained that Diana, who is believed to have stood at the same height as Charles at 5'10, ditched the two inch rule when the marriage began hit the rocks.

Princess Diana and Prince Charles got married (opens in new tab) at St Pauls' Cathedral in London in July 1981 after meeting at Diana's family home (opens in new tab), Althorp House, in 1977.

But the relationship began to turn sour not long after they tied the knot, with Prince Charles famously having an affair with his now wife, Duchess Camilla, with Diana later describing the marriage as "crowded" during her 1995 Martin Bashir interview.

Along with her iconic revenge dress moment, Diana made sure to send a message to Charles with her clothes in the best way after the break up.

LONDON - JUNE 1997: Princess Diana arrives by car to watch a performance of the ballet "Swan Lake" in June 1997 in London, England. (Photo by Anwar Hussein/WireImage)

"For years, Diana wore shoes no higher than two inches out of respect to her husband’s ego," Eloise writes, according to Insider, adding that as Diana's post-divorce confidence rocketed "so did her heels".

“Jimmy Choo recalled that at the start of their seven-year friendship, Diana always ordered flats, then, as her marriage started to crumble, the heels got higher," the book goes on to recount, quoting Jimmy Choo as saying, "First she went up to two inches, then three inches, then three ½ inches, then three ¾ inches. They just kept creeping up and up."

Caitlin is a Junior News Editor for Goodto.com, covering all things royal, celeb, lifestyle, food, and family. Having set her sights on becoming a magazine journalist when she was a child, Caitlin took on work experience stints at local papers and titles such as Cosmopolitan, Now, Reveal and Take a Break while studying for her Multimedia Journalism degree and has interviews with celebs, reality stars and the Archbishop of Canterbury under her belt (of course, she couldn't resist asking him about Meghan Markle and Prince Harry).