The Duchess of Cambridge has "recycled" an old coat that she wore to a friend's wedding last year, donning it for a thanksgiving service marking the 90th birthday of Queen Elizabeth II's husband, Prince Philip.
More than 750 guests, including senior royals, Prince Philip's Mountbatten family relatives, foreign royalty, past and present staff, and friends from the world of sailing, polo and carriage driving turned out to celebrate his milestone.
The duchess added nude heels and blue hat to the blue brocade coat to refresh the outfit, according to The Telegraph in London.
The 29-year-old newlywed has reportedly become adept at recycling her outfits.
On Saturday, she attended the wedding of close friend and jockey Sam Waley-Cohen and Annabel Ballin in the same fitted monochrome spotted dress she was photographed in four years ago when leaving a London nightclub. She also wore the same black hat that she had worn earlier in the day to watch her husband, Prince William, take part in his first Trooping the Colour.
The Duke of Edinburgh, the longest-serving consort in British history, turned 90 on Friday and Sunday's service at Saint George's Chapel in Windsor Castle, west of London, was the focal point for his birthday commemorations.
The Dean of Windsor, the Right Reverend David Conner, made the congregation laugh when he told them the duke, born a prince of Greece and Denmark, "doesn't like to the praised".
But he said praise was due for the royal patriarch, who for more than six decades has been the queen's tireless supporter.
The dean paid tribute to Prince Philip's service to Britain and the wider Commonwealth, his patronage of more than 800 organisations and his "modest" nature.
The duke, known for his plain-speaking, received a new title for his 90th birthday on Friday.
The queen made him Lord High Admiral - the titular head of the British Royal Navy - partly in recognition of the promising seafaring career he gave up to spend a lifetime at her side.
Prince Philip told the BBC he would finally scale back his workload.
"I reckon I've done my bit. I want to enjoy myself a bit now, with less responsibility, less frantic rushing about, less preparation, less trying to think of something to say," he said.
"On top of that my memory's going, I can't remember names. I'm just sort of winding down."