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Sienna Miller X M&S Is Back With An It-Girl Party Capsule

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“There’s no one that does undone, relaxed chic like the Brits. I think it’s something to do with the irreverence and the English sense of humour,” Sienna Miller said to a room full of fashion journalists while introducing her collaboration with M&S. In addressing what she loves most about British style, she could have very easily been talking about herself.

With her signature golden locks and flawless complexion, Miller very much retains the It-girl glow that first brought her such frenzied media attention over two decades ago. It’s this enduring star power that’s behind the sellout success of her partnership with the high-street stalwart. So really, it will come as no surprise that this dynamic duo is back for another round, but this time focused on Sienna-approved partywear.

Sienna Miller X M&S.

Sienna Miller X M&S.

The new collection, which drops on 31 October, draws inspiration from Sienna’s own extensive archive. The eagle-eyed among us (read: Sienna obsessives) might recognise certain hero pieces: for example, the chevron sequined minidress, which recalls the gilded Burberry mini she wore to the Met Gala after-party in 2006 (and is also, Miller notes, a nod to David Bowie in his Ziggy Stardust era). Also in the line-up is a fuzzy jacket, featuring buckles inspired by Miller’s Noughties pirate boots, and a lace-trimmed slip dress (Miller’s favourite piece from the collection) that harks back to the vintage dresses she sourced on Portobello Road.

Sienna Miller X M&S.

Sienna Miller X M&S.

“This second collection is very much a party edit for the festive season. It’s got tailoring, faux fur, party dresses, statement prints, embellishment, co-ordinating accessories and also my favourite jeans from the first collection in two new washes,” notes Miller. “Seeing my designs in the real world is so rewarding. I love how each individual wears and styles them and I can’t wait to see their reaction to round two this winter!”

Miller wearing the white suit from the collection at the collection launch.

Ricky Vigil M / Justin E Palmer

With boho nostalgia reaching fever pitch, this fashion partnership could not have been more perfectly timed. Fans of all things Y2K will be happy to hear that the 35-piece collection is every inch the Noughties’ It-girl party-dressing fantasy. The sequins! The animal print! The waistcoats! “I really think people look beautiful in floaty things, so I’m happy to see the return of boho,” shares Miller. “I just can’t believe it’s now vintage, because that makes me old!”

Whether you lived through it the first time or are just discovering the aesthetic via TikTok or Pinterest, how does Miller recommend that you wear the boho trend in 2024? “You should have elements of it [in an outfit], but not go head-to-toe, unless that’s your aesthetic. I remember in the early Noughties, people were taking everything really literally, and it just didn’t work for everyone – you have to be selective.”

Rabbani and Solimene Photography
Patrick McMullan/Getty Images

How does Miller’s 11-year-old daughter Marlowe view her mother’s archive? “I’ve somehow bred a mini Anna Wintour,” she laughs. “She is so judgemental of what I wear and has the most incredible aesthetic. She’s very, very clear on what she does and doesn’t like. I’d love to share more style tips, but I’m actually getting more from her!”

Even if her tweenager is a tough critic, we have no doubt that Sienna Miller’s latest collection for M&S will be a sell-out success.

M&S X Sienna Miller is available to shop on marksandspencer.com from Thursday 31 October.

Shop M&S X Sienna Miller:

M&S X Sienna Miller

Chain-Detail Satin Sandals

M&S X Sienna Miller

Buckle Detail Faux-Fur Jacket

M&S X Sienna Miller

Velvet Wide-Leg Trousers

M&S X Sienna Miller

Satin Maxi Dress

M&S X Sienna Miller

Pure Silk Animal-Print Tie-Neck Blouse

M&S X Sienna Miller

Animal-Print Leather Belt

M&S X Sienna Miller

Barrel-Leg Jeans

M&S X Sienna Miller

Seam-Detail Strappy Pure Silk Maxi Dress

M&S X Sienna Miller

Merino Wool-Rich Oversized Jumper With Cashmere

M&S X Sienna Miller

Velvet Animal-Print Wide-leg Trousers

M&S X Sienna Miller

Sequin Mini Dress