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Published 16:28 14 May 2019 BST
Updated 17:58 14 May 2019 BST
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It's a navy shirt dress, covered in white polka dots with a white collar.
Our favourite part of the dress would have to be the sweet vintage style buttons that go the whole way down the front.
Kate paired the dress with a gorgeous pair of blue suede court shoes by Emmy London and a navy clutch by Smythson.
All very royal, and all very gorge.
She topped it all off with a fab pair of pearl earrings, and a beaming smile.
This day out holds a particularly special place in the heart of the Duchess.
Kate's grandmother, Valerie Glassborow, was among those who worked to decipher the secrets of the German Enigma machine at the site.Celebrity