Following the sell-out success of the summer collection, which flew off the shelves within minutes, Sienna Miller joined forces with M&S once again — this time bringing her signature bohemian style to party season.

As the sole M&S designer working directly with Sienna on the collection, I collaborated closely with the Trend and Buying Leads to translate her vision into an elevated winter wardrobe, from statement party pieces to effortless occasion dressing.

Inspired by Sienna’s iconic style and archive, the collection balanced glamour and individuality with the commerciality and wearability of the M&S customer.

A woman in a white suit standing in front of a fireplace surrounded by lit candles, with branding that reads 'M&S x Sienna Miller' above the fireplace.
A young woman with red hair wearing a black velvet suit standing indoors near a fireplace with lit candles, posing with her arms crossed and smiling slightly.
A woman with blonde hair wearing a tiger-striped blazer and blue jeans is taking a selfie in a mirror. The mirror has a woven frame, and there are signs for "M&S x SIENNA MILLER" reflected in the background.
Woman in green outfit and sunglasses sitting on a wooden bench in a well-lit room with patterned tile floor and glass-paneled door.
Blonde woman in a tiger print outfit sitting on the floor against a white wall, holding her head with one hand, with a serious expression.
A woman with blonde wavy hair wearing black sunglasses and a sleeveless, sequined, patterned dress, sitting on a carpeted floor with a plain white wall behind her.
A woman with blonde hair, red lipstick, wearing a white top with lace details, sitting on a sofa in a room with dark walls and decorative columns, with sunlight coming through a window in the background.
A woman with blonde, wavy hair and dark red lipstick stands with one hand on her hip against a plain white background. She is wearing a black velvet blazer, a white blouse, dark wide-leg jeans, and black heels.
A woman with blonde hair and red lipstick wearing a sleeveless green satin dress with a slit, standing indoors next to a white radiator and a white door with crown molding. She is leaning on the door frame with one arm raised and the other resting on