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Sienna Miller has long been our ultimate style icon. From boho vibes to red carpet glamour, she always gets it right.
You can imagine, then, how excited we were to hear that she’s following in the footsteps of Holly Willoughby and Rosie Huntington-Whiteley by teaming up with none other than high street hero M&S.
It’s tough to pick favourites from the ‘Anything But Ordinary’ campaign, but check our must-have items before they sell out, starting with this on trend waistcoat.

You don’t need us to tell you what a huge trend waistcoats are at the moment.
Sienna herself wore this with the matching blazer (£69) and trousers (£39.50) to the launch of her collaboration. It’s also available in sage green if one alone won’t do.
While the weather’s still nice, team it with black linen trousers and Birkenstocks.
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Effortlessly chic: this modern take on tailoring will set you back £148 for the three piece suit
The sun might still be shining, but autumn is on its way, and there’s nothing better than stepping into the season in style with a cosy coat and some toasty new knitwear.
Sienna’s pink check coat seems to be flying off the virtual shelves since the collection launched online and in store last Thursday, and for just under £100, consider the cost per wear!
We’re also loving the lime green looks, plus the shearling coat and Celine-esque bag are definitely on our shopping list.
For tips on how to style everything, look no further than Ms. Miller herself, who said of the collection ‘I have always had a genuine love for Marks & Spencer. ‘It’s a brand that is part of the fabric of British life and holds special associations for so many people.’
Fashion Finder’s top picks

We love the brushed wool fabric, oversized fit and notched lapels on this winter warmer.
You’ll be wearing it long into spring, and will no doubt reach for it again next autumn!
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A new season take on the ever-popular sporty side stripe trousers. We see these sell out time and time again at M&S, and we’re loving the autumnal colourways that are available now.
The wide leg and relaxed fit makes them super comfortable, plus the zip at the hem is a nice touch!
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Put yourself in the limelight for the new season with this highlighter hued jumper.
This cable knit style the perfect length and fit for wearing over satin skirts like Sienna is here (modelled with the matching £35 slip skirt and £17.50 scarf), but it will look just as good with jeans and trainers.
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Quite simply, the perfect bag that will work with everything in your wardrobe.
The sophisticated gold hardware makes it look like there should be a zero or two at the end of the price tag!
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High end labels like Victoria Beckham and Loewe are going all out for ombre this season, but you don’t need to fork out a fortune to get the faded look.
For just under £50, this midi will see you through any autumnal weddings, or you can dress it down à la Sienna with the bomber jacket (£59) and belt (£25).
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Call off the search, we’ve found you the perfect pair of flats that won’t break the bank or give you blisters. They’re available in half sizes too. Hurrah for M&S!
The chain detail makes them look much more expensive. Go on… treat your feet.
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There’s no such thing as too much knitwear at this time of year, and Sienna Miller is making this M&S option look like a million dollars. Get it or regret it!
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If cowboy boots aren’t for you then sleek pointed wedges are the way forward.
These ankle boots are going to look super sleek with midi dresses, but don’t dawdle, they’re selling out fast!
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Aviator jackets never really go out of style thanks to the toasty shearling trim.
The bitter chocolate shade of this one is utterly delicious, and doesn’t Sienna look like she’s on the cover of a magazine here?
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Available in three different colours, and in sizes 6 to 24, this slinky slip satin skirt is guaranteed to become your go-to. It’s the answer to any autumnal dressing dilemma!
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This blazer is very Kate Middleton, and would work well with everything from blue jeans at weekends to tailored trousers for the office.
Everyone needs a bit of tweed. No wonder it’s Sienna’s favourite item from the collection!
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