Kate Middleton's blue polka dot dress greatly resembles one of Princess Diana's styles

Now this is a look that has stood the test of time. 

On Tuesday at the D-Day: Interception, Intelligence, Invasion exhibition at Bletchley Park in England, Kate Middleton stepped out in a blue-and-white Alessandra Rich dress that reminded royal fans of a frock Princess Diana wore nearly 34 years ago.

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Duchess Kate at Bletchley Park
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Duchess Kate at Bletchley Park
Britain's Catherine, Duchess of Cambridge, reacts as she is greeted by wellwisher during her visit to Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, is shown bricks, dedicated to her grandmother Valerie Glassborow, and aunt Mary Glassborow who both worked at Bletchley Park, during her visit to Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, leaves after a visit to the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Darren Staples/Getty Images)
Britain's Catherine, Duchess of Cambridge, reacts as she uses an Enigma cipher code machine during her visit to Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, reacts as she is greeted by wellwishers as she arrives to visit Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, reacts as she is greeted by wellwishers as she arrives to visit Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, reacts as she is greeted by wellwishers as she arrives to visit Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, is shown bricks, dedicated to her grandmother Valerie Glassborow, and aunt Mary Glassborow who both worked at Bletchley Park, during her visit to Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
Britain's Catherine, Duchess of Cambridge, reacts as she is greeted by wellwishers as she arrives to visit Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Karwai Tang/WireImage)
Britain's Catherine, Duchess of Cambridge, reacts as she uses an Enigma cipher code machine during her visit to Bletchley Park in Bletchley, north west of London, on May 14, 2019. - The Duchess visited Bletchley Park, the home of Britain's UK codebreaking during WWII, to view a special D-Day exhibition in the newly restored Teleprinter Building. (Photo by Heathcliff O'Malley / POOL / AFP) (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, leaves after visiting the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Darren Staples/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Mark Cuthbert/UK Press via Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Mark Cuthbert/UK Press via Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Mark Cuthbert/UK Press via Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, arrives for a visit to the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Darren Staples/Getty Images)
BLETCHLEY, ENGLAND - MAY 14: Catherine, Duchess of Cambridge, visits the D-Day exhibition at Bletchley Park on May 14, 2019 in Bletchley, England. The D-Day exhibition marks the 75th anniversary of the D-Day landings. (Photo by Mark Cuthbert/UK Press via Getty Images)
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The Duchess of Cambridge paired the style with delicate pearl drop earrings, suede heels by Emmy London and a navy purse by Smythson. The mid-length dress with vintage-inspired contrast collar and cuffs as well as large white buttons is nearly identical to a look that Diana wore during a photo shoot at Kensington Palace back in October 1985.

Kate's dress is clearly a favorite of hers as she sported the same style for Prince Charles' official 70th birthday portraits last year. Similar dresses have also been worn by a slew of other stars, including Meghan Markle's pal and former Suits co-star, Abigail Spencer, and Kelly Ripa. 

This isn't the first time the 37-year-old royal has taken a style cue from the late Princess of Wales. Check out some of Kate's most regal looks.

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