If I could spend a day in any celebrity’s wardrobe, it would be Sienna Miller’s. Whilst her red-carpet looks consistently create a buzz in our office, it’s her off-duty outfits that we draw inspiration from season after season. Effortless ease has become a calling card for her outfits, consistently unfussy and yet impactful; each one is a harmonious balancing act of relaxed yet polished, comfortable yet cool, and more often than not, a mix of high-low buys. Yes, she’s always ahead of the curve with the next luxury It buy (look to the Gucci Gigilio bag), whilst simultaneously confirming there are seriously expensive-looking buys to be found on the high street.

From Aligne to Sézane to Mango and beyond, Sienna Miller is known for weaving high-street buys into her most polished looks. The pieces in question rarely follow trends, but focus on proportion, texture and styling to signal luxury without breaking the bank. Having studied her looks closely, I’ve realised that these affordable additions all share a common theme that ensures their elevated appeal: they’re unfussy, timeless in composition, and transcend the trend cycle. Think of the sightings in that Sézane trench coat, which is brought back every single year. Simply, they’re smart purchases that can be restyled over and over again. And that’s exactly what my wardrobe is calling out for.

Now that I’ve decoded her approach to shopping the high street, I set myself the task of building a Sienna Miller–coded wish list of elevated buys, exclusively from Zara. Her instinctive mastery of high-low dressing isn’t just about price, but about balance. Each outfit pairs ease with polish in perfect harmony: relaxed jeans offset by a smart blazer, a floaty dress grounded with sharp boots, or a cool jacket worn with tailored trousers. The result is always effortless, yet undeniably put together. And Zara, with its bohemian sensibility and increasingly elevated basics, captures Sienna’s signature ease to a tee.

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