Royal author Ingrid Seward recalled a story she was told by the monarch’s dress designer Ian Thomas. He was adjusting the Queen’s hem when the Duke of Edinburgh walked past the dressing room.
Philip paid the monarch a sweet compliment about her gown which left her blushing.
Ms Seward told Channel 5 documentary Secrets of Royal Dressmakers: “When he was doing the hem, Prince Philip walked through the Queen’s dressing room and said ‘hmm, nice dress’.
“The Queen flushed scarlet. I always remember him telling me that story.
“She was just so thrilled to get the compliment from her husband who’s normally so brusque and offhand.”
Mr Thomas was the Queen’s dress designer for over 20 years until his death in 1992.
He opened his own business in Lowndes Street, Belgravia, in 1969.
He also dressed other members of the Royal Family and was awarded a Royal Warrant as a dressmaker in 1973.
During the documentary, the royal experts also discussed Sarah Ferguson’s style.
READ MORE: Prince Philip ‘battled’ Queen’s mother for ‘influence’ over monarch
Royal editor Emily Andrews insisted Sarah’s fashion choices have improved over the years.
She said: “As an older woman now she has got her style absolutely on point.
“She’s got really good legs, she always wears dresses or pleated skirts, a top and a blazer and she’s got that lovely red hair.”
The documentary also claims the Duchess of Cambridge was left in tears after details of her wedding dress designer were leaked to the press.
Kate wore a stunning gown by Alexander McQueen’s Sarah Burton for her 2011 royal wedding to Prince William.
Royal expert Katie Nicholl told the programme: “Behind the scenes I think that caused tears at the palace because Kate had done everything she could to keep the wedding dress a secret.”