Sienna Miller has designed the ultimate boho-chic summer clothing collection for M&S

Kamali’s silk mousseline, ruffled Chloé frocks might set you back £3,900, but Miller has created similar designs – in baby blue and ivory cotton – for just £89. It’s “Sienna’s ‘dress of the season” reads a statement from the brand. “Without doubt the hero of the entire collection.” Completing this summer Sienna-drobe are metallic, thong sandals (£49.50), a trusty pair of baggy, blue jeans (£49.50), various, simple swimsuits and Ibiza-ready cowboy boot mules (£65). “I have always had a genuine love for M&S — it’s a brand that is part of the fabric of British life and holds special associations for so many people,” says Miller. “To collaborate on a womenswear design project made total sense. I can’t wait to see what customers think.”