Sienna Miller and M&S have your cool-girl autumn wardrobe covered

Sienna Miller just wore the 'cool girl' coat trend of the season

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Sienna Miller and M&S have your cool-girl autumn wardrobe covered

Sienna Miller just wore the 'cool girl' coat trend of the season

Sienna Miller and M&S have your cool-girl autumn wardrobe covered

4 Stylish Autumn Outfits Entirely From Marks and Spencer

Sienna Miller X M&S has landed for your autumn wardrobe

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Sienna Miller announces new M&S collection of 'timeless, versatile