The Duchess of Cambridge has stepped out looking elegant in the perfect winter dress, a dark green piece by one of her go-to British brands, Beulah London.

Kate completed her long-sleeved outfit with a flattering black and gold buckled belt at her waist.

The bespoke piece is similar to the luxury brand's Yahvi Midi Dress, which costs £550.

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The Duchess Of Cambridge Launches Family Action Support Line
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The Duchess added simple court shoes and a matching clutch bag with her hair worn down for her appearance at London charity Family Action, which aims to support families suffering from a range of issues, including mental health problems and relationship difficulties.

Kate's visit coincides with the charity's launch of a new confidential helpline to help families in need.

During her visit, Kate will meet with families who have received support from the charity, and will also spend time with both volunteers and young carers.

Luckily for those of us who'd love to emulate the duchess' designer look, we've found a high street alternative from Boden, which just so happens to include black detailing at the waist for a flattering finish.

Shop this, and some more of our other favourite long-sleeved dark green dresses below...

Mia Ottoman Dress
Boden Mia Ottoman Dress
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Credit: Boden
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L.K. Bennett Izzy Green Velvet Dress
Credit: L.K. Bennett
Analise Seam Detail Crepe Dress
Reiss Analise Seam Detail Crepe Dress
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Credit: Reiss
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Wallis Jolie Moi Green Twist Maxi Dress
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The Duchess Of Cambridge Launches Family Action Support Line

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