However, former owner June Kenton said she had been told by Buckingham Palace six months ago that the company would have its royal warrant rescinded over her memoirs, in which she detailed personal bra fittings with the Queen and Princess Diana.
There are now around 800 companies that hold Royal Warrants, according to the Royal Warrant Holders Association.
For 57 years, Rigby & Peller held the royal warrant as the exclusive corsetiere of the royals - until former owner June Kenton published her autobiography, Storm in a D-Cup.
Kenton said that the book is mainly about herself - a "gentle" narrative of her life which she is "proud" of and eager to share.
"I never met Diana's boys, but I used to give her lingerie and swimwear posters for them to put up in their studies at Eton", Julie wrote. It has been reported the decision to cancel the warrant is linked with revelations in the book, though neither the palace nor the company would confirm that.
Russel Tanguay, the director of royal warrants at the Royal Warrants Holders Association, confirmed to the Express that Rigby & Peller lost its royal warrant - i.e., its right to advertise itself as a royal supplier - in mid-2017. "I can't fight with Buckingham Palace and I wouldn't want to, but it's hard".
Kenton purchased the company in 1982 and still remains on its board despite selling a majority stake in 2011 for £8 million.
She added: "I think it's unbelievable".More news: Sugar Bowl: Alabama vs. Clemson
One such fitting was with the Queen Mother and Princess Margaret in a room in the Palace.
Kenton revealed how she carried out bra-fittings with the queen.
Of their first meeting, Kenton said: "There are no words to describe the terror I felt". The book was not a kiss-and-tell.
Now there are three people, known as the grantors, who may award them - the Queen, the Duke of Edinburgh, and the Prince of Wales.
Harrods chose not to apply to have their warrant renewed in 2000 when Mohamed al-Fayed made a decision to end the store's links to the royal family following the death of his son, Dodi, and Princess Diana.
The book detailed his time as a butler to Prince Charles and Princess Diana at Highgrove House in Gloucestershire and his move to Diana's staff after their divorce.
It can also be lost over a company's reputation - Hoover's was revoked in 2004 following an unflattering BBC documentary about the vacuum company.