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Princess Kate debuted a fresh new look this week - and it's not her hair we are talking about. Her sleek white shirt instantly caught our attention, making the perfect wardrobe staple for AW25.

The Princess of Wales visited the Natural History Museum with Prince William, marking her return to royal duties after the family's summer break. She opted for a polished yet understated outfit, anchored by a crisp white button-down from With Nothing Underneath, a sustainable British label she has championed before.

Priced at £120, the timeless shirt is a versatile piece that can be styled across seasons. But you don't need a royal budget to recreate the look as we've tracked down chic high-street alternatives that echo Kate's pared-back elegance for less.

Princess Kate's With Nothing Underneath shirt is a must-have staple, available in sizes 8 to 18. Crafted from 100% Tencel and B Corp certified, it's a sustainable choice that doesn't compromise on style. With its longer length, subtly off-the-shoulder cut, and relaxed drape, it's versatile enough to dress up with tailored trousers or down with jeans, making it a smart buy for any wardrobe. While Kate opted for the off-white shade, the shirt also comes in a range of other colourways, including a striped pattern.

• Buy the exact white shirt Princess Kate wore - for £120

This crisp white button-down offers a similar polished yet effortless vibe. Available in sizes 4 to 22, it's made from 100% cotton, making it a breathable and timeless wardrobe essential. It comes in both regular and petite cuts, ensuring a flattering fit for all body types. It also comes in a range of colourways, including a playful pink-and-white stripe for a modern twist on the classic.

• Buy the Sienna Cotton Shirt from Boden - for £59

This classic white shirt channels the same polished simplicity as Princess Kate's design. Available in sizes 8 to 22, it's made from 100% cotton. The cut is slightly boxy with a pleat at the back, giving it a relaxed yet structured shape that works for both smart and casual styling. While the crisp white version is closest to Kate's look, it also comes in navy for a versatile wardrobe update.

• Buy the White Boxy Fit Long Sleeve Shirt from New Look - for £23.99

This H&M option offers an elevated twist that Princess Kate would no doubt approve of. Available in sizes XXS to XXL (excluding XS), it's tailored in a slim fit with a sharp turn-down collar, giving it a sleek and modern edge. Subtle shoulder pads, a favourite style of Kate's, and a nipped-in waist create a flattering silhouette, while long sleeves with a slit and buttoned cuffs add refined detailing. It also comes in a chic light blue stripe for a fresh alternative.

• Buy the padded shirt from H&M - for £23.99