Sienna Miller’s ‘Undone Chic’ Collection for Marks & Spencer: A British Fashion Moment

Marks & Spencer, the high-street retailer known for its iconic Rosie bra and, more recently, its foray into chic collaborations, is once again making waves in the fashion world. This time, it’s Sienna Miller, the renowned actress and style icon, who’s lending her effortlessly cool aesthetic to the brand. Following the success of her debut collection in June, Miller has unveiled a 35-piece party collection brimming with vintage-inspired pieces. Think velvet blazers that whisper of bygone glamour, tiger-striped waistcoats that inject a touch of playful rebellion, ruffled blouses that exude romantic charm, and a show-stopping lime-green dress that rivals even Victoria Beckham’s coveted designs. Miller’s signature style, dubbed ‘undone chic,’ is a perfect fit for the British sensibility. As she herself explains, “There’s no one that does undone, relaxed chic like the Brits. I think it’s something to do with the irreverence and the English sense of humour.” The collection is a masterclass in high-low dressing, a concept that’s deeply ingrained in British fashion. Jonathan Anderson, the acclaimed designer, recently referenced Marks & Spencer’s multi-pack vests in his autumn/winter 2024 collection, showcasing the brand’s enduring influence. And, even seasoned fashion editors have been known to sport second-hand Per Una skirts (Marks & Spencer’s most frilly sub-brand) with designer heels, proving that British style is about mixing and matching, and never taking yourself too seriously. The collection’s launch event saw Miller herself embody the spirit of the collection in a Bianca Jagger-inspired M&S trouser suit, a nod to the glamorous disco era. “No one partied like they did then, so I tried to capture that spirit,” she shared. With Sienna Miller at the helm, Marks & Spencer is once again demonstrating that it’s not just a retailer for staples, but a destination for effortlessly stylish, and undeniably British, fashion.

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