• Prince Harry gets candid in his new Netflix series
  • Among many topics, he admits to his "biggest mistake"
  • It was when he wore a Nazi costume many years ago

Bad memories: Prince Harry deeply regrets this faux pas! In his Netflix documentary, he addresses the biggest mistake of his life.

In 2005, he was photographed attending a costume party in a Nazi uniform – complete with swastika armband and Wehrmacht patch on his collar.

Prince Harry reflects on his Nazi costume scandal

"It was one of the biggest mistakes of my life," Prince Harry admits. "I felt so ashamed afterwards."

But the Royal has learned from his mistakes. "All I wanted to do was make it right," he adds. "I sat down and spoke to the chief rabbi in London, which had a profound impact on me."

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And that's not all: "I went to Berlin and spoke to a Holocaust survivor. I could have just ignored it and gone on and probably made the same mistakes over and over again in my life. But I learnt from that."

With the incident, the then 20-year-old Prince made the front page of newspapers around the world.

"I am very sorry if I caused any offense or embarrassment to anyone. It was a poor choice of costume and I apologize," Harry said in a statement at the time.

See more in the video above.