Luxurious lingerie company Rigby & Peller has been popular with the female members of the royal family for 57 years.
Now the store has been stripped of its royal warrant after the woman who owned the company for almost 30 years wrote a book that told the story of her professional life.
There would be a "gaping hole" in her autobiography if she had not mentioned her work for the Queen, said Ms Kenton, adding that she did not write the book with the intention of upsetting anyone.
Warrants go to those who have supplied the households of the Queen, the Duke of Edinburgh, or Prince Charles for at least five years.
There are now about 800 royal warrant holders, including individuals, small firms and global conglomerates.
Queen Elizabeth II is driven away after attending a Sunday service at St Mary Magdalene church on the Royal Sandringham estate in Norfolk. "I have never, ever spoken about what I do there with her, or the Queen Mother, or Princess Margaret", Kenton said in a statement, per the BBC.
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June Kenton, right, with Gok Wan at Rigby & Peller's flagship store in Knightsbridge, London.
"I recognised the swimsuits in photos of her on that last fateful yachting trip with Dodi Fayed".
But apparently, the Queen didn't want people to know that her corgis were in the room while she was half-dressed.
Rigby & Peller founder June Kenton started fitting the Queen in 1960.
"I think it's unbelievable. I've had the royal warrant for so long I never imagined that this would happen".
But when the former owner published personal accounts of the royal family in her memoirs, the company was stripped of its royal warrant.
Mrs Kenton bought the lingerie company with her husband in 1982 for £20,000 (US$27,000) before selling a majority stake in 2011 for £8 million (US$10.8 million).
"I'm coming towards the end of my life, I'm 82, so it is what is it, there is nothing I can do".
Rigby & Peller's United Kingdom office and Belgian parent company Van de Velde were unavailable for comment when contacted by Lingerie Insight.