The Duke of Sussex claimed that Prince William and his sister-in-law Kate told him to dress like a Nazi in 2005.
Prince Harry, who was 20 at the time, caused outrage when he was displayed in a military uniform and swastika armband for a fancy dress party.
However, in his highly anticipated autobiography Spare, he added that he accused his brother and aunt of coming up with the idea and that they “howled with laughter” when they saw him wearing it.
In a chapter of the book obtained by Page Six, Harry reportedly wrote about choosing the outfit, saying that it was a shot between a pilot’s uniform and a Nazi uniform.
“I called Willy and Kate and asked what they thought. They said it was a Nazi uniform,” Harry says in his memoirs, according to Page Six.
The Duke reportedly continued to explain that he had gone home and tried on the outfit for them.
“They both howled,” he adds. “Worse than Willy’s leotard outfit! Much more ridiculous! Again, that was the issue.
The Duke of Sussex addressed the scandal in the third episode of the six-part documentary series Harry & Meghan, which aired on Netflix last month.
At the time he described it as “perhaps one of the biggest mistakes of my life” and added: “I was very embarrassed afterwards. All I wanted to do was fix it.”
Spare will be released on January 10, but has been previewed by some news outlets.
In another leaked quote seen by The Guardian, the Duke of Sussex reportedly claimed that Prince William physically assaulted him once because of the young prince’s marriage to Meghan.
Prince Harry claimed that the shootout took place at his London home in 2019 and left him with a visible injury to his back after the Prince of Wales grabbed his brother by the collar and tore off his necklace and knocked him to the ground.
Harry also claimed that William had described the American actress as “difficult”, “vulgar” and “corrosive” – the comments the younger brother had made parroted the “press narrative” about his wife.
The “extraordinary scene” is “one of many in The Reserve”, according to The Guardian.
The newspaper said it was able to obtain a copy of the book despite “strict pre-launch security measures regarding the book”.
Spare has been described by its publishers as “a landmark publication brimming with insight, revelation and self-examination”, written with “raw, unflinching honesty”.
Earlier readers suggested that their relationship with his brother and sister-in-law may have worsened.
“Overall, I think the book [will be] worse for them than the Royal family expected,” a source told The Sunday Times. “Everything has been revealed. Charles turned out better than I expected, but it’s especially tough for William and even Kate is getting a little wide.
The source added: “There’s an explanation for these little details and the fight between the brothers. I personally don’t see how Harry and William can ever make up after that.”
Buckingam Palace and Kensington Palace were approached for comment.