Seven photographs that have never been published or exhibited before are among 70 of Princess Diana going on display at her former home, Kensington Palace.
Diana appears in dresses she planned to auction for charity
In her last fashion shoot, five months before she died in a car crash in Paris, Diana wore dresses she planned to auction for charity later in 1997.
To publicise the New York auction, photographer Mario Testino took 15 pictures for Vanity Fair magazine.
Nine of Diana's dresses, including the four in the shoot, also go on display.
One, by Japanese designer Hachi, has never been exhibited before.
Mario Testino took 15 pictures for Vanity Fair magazine
The off-white, one-sleeve dress, embroidered with mirrored glass beads and crystal, is on six-month loan from a fashion museum in Chile that will open next year.
Diana first wore the dress in 1983 - curator of the Kensington Palace dress collection Beatrice Behlen said it prefigured the style she adopted later in life.
"When she came out in this dress, there was a lot of public comment," Ms Behlan said.
"It is quite significant because at the time she used to wear very frilly, princessy things."
Testino's photographs "remind me of when you want to go to a party and you are trying on different outfits, and someone is taking a few snaps - a few really good snaps", Ms Behlen said.
"They do not look like a photo shoot," she added.