Diana, Princess of Wales's landmines outfit is to go on display at Kensington Palace for the first time.
The Halo Trust branded protective vest worn by the princess on her high profile visit to Angola in 1997 will form part of the Diana: Her Fashion Story exhibition at her former home.
A simple sleeveless blue denim shirt and the Armani chinos also worn by Diana during the trip will also be on show.
The Duke of Cambridge and Prince Harry have loaned the exhibition the items which belonged to their late mother.
Diana famously walked through a cleared landmine area in the African country to highlight the problem with the military munitions.
The visit took place just months before she died in a car crash in Paris.
Other new items on loan from William and Harry include a glamorous, purple Versace gown worn by the princess to a Chicago fundraising gala in aid of cancer charities, and the pink Bellville Sassoon suit she wore to board the train on her way to her honeymoon in 1981.
Five other new outfits are being added to Diana: Her Fashion Story at the west London palace from April 26.
They include a sumptuous green satin Victor Edelstein evening gown worn for an official portrait by Terence Donovan in 1986; a striking floor length gown by Yuki, designed for the Prince and Princess of Wales's visit to Japan; and a tartan day dress by Caroline Charles, worn to the 1982 Braemar Games in the Scottish Highlands.
There will also be a light blue silk Catherine Walker day dress worn on an official tour of New Zealand in April 1983, and a striking Catherine Walker black and red evening gown worn to a Pavarotti concert at the Royal Albert Hall in aid of the Red Cross 125th Birthday Appeal in 1995.
Eleri Lynn, exhibition curator at Historic Royal Palaces, said: "Diana, Princess of Wales was one of the most photographed women in the world, and it's no coincidence that so many of her outfits are now among the most easily recognisable in fashion history.
"Through Diana: Her Fashion Story we explore the evolution of a young woman who had to first learn the rules of royal and diplomatic dressing, then master the art of creating her own signature style."
The special exhibition first opened in 2017 but is continuing throughout 2018.