You may recall that Duchess Catherine visited the historic site in 2014, which holds special significance as her grandmother, Valerie Glassborow, was a codebreaker during World War II.

For today’s visit, Duchess Catherine chose to wear a mix of outfits we’ve seen her wear before, allowing us to take a closer look at her Alessandra Rich dress, which was originally featured in family photos taken to celebrate Prince Charles’ 70th birthday.

The dress she wore was the Alessandra Rich Pleated Navy Polka Dot Midi Dress. For accessories, she carried a Smythson Navy Panama Bag with a strap.

On her feet, she wore Emmy London's 'Rebecca' shoes in Riviera Blue, which debuted at the Carter-Snuggs wedding in September 2018. Her earrings included Annoushka Pearl and Kiki Diamond Hoop Earrings.

She also accessorized herself with a Bletchley Park commemorative brooch, which represents the rotors used in the historic code-breaking machines. This particular brooch originally belonged to Duchess Catherine's grandmother, Valerie Middleton, also known by her maiden name Glassborow.