BBC News-The dress that Diana, Princess of Wales, wore on her wedding day 40 years ago is going on display at her former Kensington Palace home.
The dukes of Cambridge and Sussex have loaned the dress to the exhibition, which begins a month before Diana would have turned 60.
It was designed by David and Elizabeth Emanuel for the July 1981 wedding.
The gown features a 25ft (7.6m) sequin-encrusted train, which filled the aisle of St Paul’s Cathedral.
Organisers of the exhibition, Royal Style in the Making, say the dress is “now among the most famous in bridal history”.
The dress has a fitted bodice overlaid with panels of antique Carrickmacross lace originally belonging to Queen Mary.
In a video shown at the exhibition, Ms Emanuel remembers Diana phoning to ask her and her then-husband to make her dress.
“It was one of those strange moments where you know your life is never going to be the same again,” she said.
As well as their mother’s wedding dress, Princes William and Harry have also loaned her going-away dresses to the show.
The exhibition, which looks at designing an outfit for a royal client and also features those who dressed the Queen, Princess Margaret and the Queen Mother, is being held at the Kensington Palace Orangery.
It opens to the public on 3 June and continues on to early January 2022.