M&S X Sienna Miller

From statement dresses to mix-and-match separates, create an outfit worthy of any occasion courtesy of the M&S X Sienna Miller partywear collection. Choose chic suits and silhouettes for a tailored, menswear-inspired expression – or go full glamour with sparkly sequins, luxe velvet and vintage-inspired faux-fur. If you’re trying on at home, our hassle-free returns keep things simple