June Kenton said Rigby & Peller lost its right to display the royal coat of arms in 2016 after she mentioned the royals in "Storm in a D-cup."
While Kenton said she never discusses what happens in a fitting room, the book recounts her first meeting with the monarch and her trepidation about being ushered into the royal bedroom.
The 82-year-old Kenton says losing the warrant "absolutely killed" her and that she regrets "not being wise enough" to omit mention of the royals in her autobiography.
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