What does one wear for the emotional moment of dropping one’s eldest son off for his first day at Eton? When you’re Catherine, Princess of Wales, the answer’s obvious: stick to an old reliable that delivers on comfort (both emotional and physical!) and style.

Both Prince William and the Princess of Wales accompanied 13-year-old Prince George to meet Eton’s headmaster, Simon Henderson, and Sir Nicholas Coleridge, the school’s Provost, before George’s first day of secondary school. While Prince George and Prince William wore matching looks comprised of a dark blazer, trousers, a crisp white shirt and a blue tie, Catherine opted for a style she’s reached for again and again over the years: a dark green, long-sleeved dress.

eton, england september 8: catherine, princess of wales (l) and prince william, prince of wales (r) walk with their 13 year old son, prince george of wales (c), as he arrives for his first day at eton college on september 8, 2026 in berkshire, england. (photo by adrian dennis wpa pool/getty images)
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The dress is by Emilia Wickstead, and it’s been in the Royal’s wardrobe for quite some time. We most recently spotted Kate wearing the piece in 2023, to meet Sweden’s Crown Princess Victoria at Windsor Castle.

eton, england september 8: catherine, princess of wales (l) and prince william, prince of wales (r) walk with their 13 year old son, prince george of wales (c), as he arrives for his first day at eton college on september 8, 2026 in berkshire, england. (photo by adrian dennis wpa pool/getty images)
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The colour, too, is a firm favourite of Princess Catherine’s. She has previously opted for similar shades of deep forest or bottle green for everything from the Royal Variety Performance to appearances with the family. For this year’s Commonwealth Games, which she attended with the Prince William, Prince George, Princess Charlotte and Prince Louis, she opted for a smart green blazer over her usual stripes. Whether it’s in the form of a simple shift dress, a sparkling gown or a gorgeous coat, if it’s deep green, Catherine’s going to wear it – and look great doing so.

catherine, duchess of cambridge arrives to present the queen elizabeth ii award for british design at an event hosted by the british fashion council at london’s design museum., london, uk.04/05/2022credit photo (c)karwai tangfor more information, please contact:karwai tang 07950 192531karwai@karwaitang.com
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london, england november 19: (embargoed for publication in uk newspapers until 24 hours after create date and time) catherine, princess of wales attends the royal variety performance at the royal albert hall on november 19, 2025 in london, england. the annual royal variety performance is the world's longest running entertainment show with the first 'royal show' being held in 1912. the event supports the royal variety charity which aids uk entertainment industry members in need. (photo by max mumby/indigo/getty images)
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The exact Emilia Wickstead dress the Princess wore today is not available for purchase, but you can still copy Kate’s style. Finery has a very similar deep green dress for just £69.

Finery Caley Bottle Green Crepe Midi Dress

Caley Bottle Green Crepe Midi Dress

Finery Caley Bottle Green Crepe Midi Dress

Credit: Finery

The Royal couple were all smiles for the momentous occasion, in spite of the dreary weather. After walking through Eton’s cobblestone schoolyard armed with umbrellas, the family greeted the school’s staff, who reportedly told Prince George: ‘Good luck, enjoy it.’