Diana’s most iconic fashion moments are currently on display at Kensington Palace in "Diana: Her Fashion Story,” an exhibit that showcases 25 dresses and outfits Diana wore from her early 20s until her death.
"Fashion is such a good medium to talk about the princess because although she didn’t like to be known as a clotheshorse, she intuitively understood the language of clothes," the exhibit's curator, Eleri Lynn, told ABC News earlier this year. "[Diana] really used it to help her do the job at hand as a princess, humanitarian and patron of the arts."
Lynn noted that Diana also adapted fashion to suit her high-profile role as a humanitarian whose frequent interactions with everyday people and the downtrodden affectionately earned her the moniker "the People's Princess."
"When she was visiting children’s hospitals, for example, she would wear bright cheerful colors so that the children would find her approachable," Lynn said of Diana. "She very rarely wore gloves because she liked to hold hands and she stopped wearing hats after a while because she said, ‘You can’t cuddle a child in a hat.’"
It was also Walker who created the iconic white dress with a collared jacket that Diana dubbed her "Elvis dress." Diana first wore the dress to Hong Kong in 1989 and later paired it with her favorite tiara, the pearl and diamond Cambridge Lover's Knot Tiara.
"She had a sense of experimentation and fun with her fashion," said Lynn. "What you see in her style is that often she had a bit of a playful sense."
When Diana traveled abroad, she was known for fashion that paid homage to the host nation.
Lynn said of Diana's style on official royal trips, "She was also representing Britain so her clothing did represent the best of British fashion but also [sent] diplomatic messages when she went on international travels."
When Kate brought George home from the hospital in 2013, she chose a polka dot dress by Jenny Packham that bore a resemblance to the Catherine Walker polka dot dress Diana wore to bring William home from the hospital in 1982.
Kate has also started accessorizing her outfits with some of Diana's dazzling jewels in addition to Diana's engagement ring, which William presented to Kate in 2010.
Kate selected a triple-strand pearl and diamond bracelet often seen worn by Diana to wear during her family's diplomatic tour of Germany in July.
Kate has also worn Diana's favorite sapphire earrings -- a single Saudi Arabian sapphire surrounded by 10 diamonds -- that coordinate with her engagement ring.
The earrings, bequeathed to William and Harry in Diana's will, were a gift from William to Kate shortly after their engagement in 2010. Kate has added her own style to the famous jewels by adapting them to a drop-style earring.
Kate has not yet publicly worn Diana's most iconic piece of jewelry, a seven-strand pearl choker surrounding a large diamond-encrusted sapphire.
The sapphire brooch was a wedding gift from Queen Elizabeth the Queen Mother that Diana transformed into the pearl choker that became one of her most iconic jewels.