Princess Diana at her wedding rehearsal in July 1981; the Duchess of Cambridge at the Sunken Garden at Kensington Palace in August 2017.
Diana in the Cambridge Lovers' Knot tiara in Hong Kong in 1989; Kate in the same tiara at Buckingham Palace in December 2016.
Diana wearing Catherine Walker at a dinner in Paris in November 1988; Kate in Erdem at the 100 Women In Hedge Funds Gala at the Victoria and Albert Museum in October 2015.
Diana visits the Barnados Charity in November 1984; Kate in Manchester in December 2017.
Diana skiing in Switzerland in February 1986; Kate also skiing in Switzerland in March 2005.
Diana in Catherine Walker in Qatar in November 1986; Kate in Jenny Packham at the Palladium Theatre in London in November 2017.
Diana at the Remembrance Sunday Service in 1991; Kate in a Diane Von Furstenberg coat at the same service in 2016.
Diana in Bruce Oldfield at a movie premiere in November 1991; Kate in Beulah London at a reception in Thimphu, Bhutan in April 2016.
Diana in Jasper Conran during a visit to Canada in June 1983; Kate visiting Bacon's College in July 2012.
Diana in Yuki before a dinner in Japan in May 1986; Kate in Jenny Packham at a Bollywood gala in Mumbai, India in April 2016.
Diana attending a premiere in London's West End in April 1993; Kate in Temperley London meeting the Prime Minister of India in New Delhi in April 2016.
Diana in Catherine Walker on a visit to the Isle of Wight in May 1985; Kate in Alexander McQueen at Princess Charlotte's christening in July 2015.
Diana in Versace at a dinner at the Field Museum Of Natural History in Chicago in June 1996; Kate celebrates National Canada Day in an Issa dress during the Royal Tour of North America in July 2011.
Diana at Buckingham Palace in 1980; Kate wearing Alexander McQueen in Charlottetown, Canada during the Royal Tour of North America in July 2011.
Diana in Bruce Oldfield at the Grosvenor House Hotel in London in March 1985; Kate in Jenny Packham at the National Memorial Arboretum Appeal at St James's Palace in London in November 2011.
Diana in 1988; Kate leaving for Clarence House for the reception following her wedding in April 2011.
Diana wearing Catherine Walker in Sicily during the Royal Tour of Italy in April 1985; Kate in Emilia Wickstead at a garden party at Buckingham Palace in May 2012.
Diana in Melbourne in October 1985; Kate in Jenny Packham at Royal Albert Hall in May 2012.
Diana at the Royal Ascot in June 1986; Kate in Singapore during the Diamond Jubilee Tour in September 2012.
Diana in a dress by the Emanuels at a dinner at the German Embassy in London in 1986; Kate at an official dinner hosted by Malaysia's Head of State in Kuala Lumpur during the Diamond Jubilee Tour in September 2012.
Diana in a coat by the Emanuels while touring Venice with Charles in 1985; Kate wears Alexander McQueen while visiting St. Andrew's School, her alma mater, in November 2012.
Diana in Catherine Walker at Easter services in April 1987; Kate wears a Matthew Williamson coat while visiting Pembroke Refinery in Pembroke, Wales in November 2014.
Diana in Bruce Oldfield at an official dinner in Lisbon, Portugal in February1987; Kate in Jenny Packham at the 600th Anniversary Dinner for St. Andrews in December 2014.
Diana visits Westminster in June 1990; Kate visits the Stephen Lawrence Centre in London in March 2015.
Diana and Charles announce their engagement in February 1981; Kate and William announce their engagement in November 2010.
Diana attends her first public event with Prince Charles, at London's Goldsmith's Hall, in 1981; Kate at the Sun Military Awards in 2011.
Diana at her wedding to Prince Charles in 1981; Kate at her wedding to Prince William in 2011.
Diana on her first official visit to Wales, in 1981; Kate attends the wedding of Laura Parker Bowles and Harry Lopes in 2006.
Diana and Charles present William on the day after his birth in 1982; Kate and William with Prince George on the day after his birth, 2013.
Diana visits Alice Springs during the Royal Tour of Australia and New Zealand in 1983; Kate arrives at Calgary Airport for the Royal Tour of North America in 2011.
Diana in Wanganui, New Zealand during the Royal Tour of New Zealand in 1983; Kate gives her first public speech at East Anglia's Children's Hospices in 2012.
Diana and Charles at Ayers Rock in Australia in 1983; Kate and William at Ayers Rock in 2014.
Diana in a Jasper Conran suit in 1983; Kate at a St. Patrick's Day parade in 2014.
Diana arrives at Birmingham Airport in Catherine Walker, 1984; Kate and Prince George arrive at Wellington Airport in New Zealand for the beginning of the Royal Tour of Australia and New Zealand, 2014.
Diana carries a young Prince Harry off a plane at Aberdeen airport in Scotland in 1985; Kate, William and Prince George board their flight from Australia on the final day of the Royal Tour of Australia and New Zealand, 2014.
Diana, in Victor Edelstein, awards a prize to Prince Charles' polo manager in 1987; Kate visits the Warner Bros. Studio Tour London in 2013.
Diana wears Catherine Walker for a passing out parade in Surrey in 1987; Kate visits Bletchley Park wearing Alexander McQueen, 2014.
Diana wears Catherine Walker to the Cannes Film Festival in 1987; Kate wears Marchesa to a BAFTA event in Los Angeles in 2011.
Diana in Sandringham on Christmas Day 1993; Kate attends the Sovereign's Parade At The Royal Military Academy in Berkshire in 2006.
Diana visits Shaukat Khanum Memorial Hospital in Pakistan in 1996; Kate visits Assyakirin Mosque in Malaysia in 2012.