Crafted from pure silk, this lingerie-inspired maxi dress adds a little laidback glamour to Sienna's collection. Reminiscent of pre-loved vintage pieces she would find among the stalls of Portobello Market in London, it's the subtle details that make the dress quietly luxurious. Cut on the bias, the relaxed fit skims in all the right places, while the deep v at the back and delicate embroidery around the neckline make this an endlessly sophisticated choice. M&S X SIENNA MILLER Womens M&S X SIENNA MILLER Lace-Trim Pure Silk Maxi Dress