Sienna Miller Just Wore the Boho Dress and Boots Formula Everyone Will Copy This Autumn

When it comes to fashion, Sienna Miller is typically a season or two ahead of the rest of us. Somehow able to see into the future, the style icon seems to predict the upcoming season's biggest trends well before we've wrapped our heads around this season's.
Attending the L.A. premiere of her latest film Horizon: An American Saga, Miller stepped out in an elegant ensemble that looked fresh off an autumn mood board. Wearing a flowy white dress with lace embroidery, ruffle detailing and slim spaghetti straps from Chloé’s S/S 25 collection, the actor picked up on the key summer trend destined to seep into the latter half of the year, too.
Whilst we always see white midis and minidresses dominate throughout the warmer months, this autumn, we anticipate that hemlines will drop as the pretty white dress takes on a longline form. Treating us to the ultimate autumn-ready paring early, Miller wore her breezy dress with a pair of black knee-high boots, crafting a cool-weather look that remains loyal to her iconic boho-chic style. She took a pared-back approach to accessorising the look, selecting simple pieces that elevated her look effortlessly. Wearing an elegant gold choker and a dainty charm bracelet, Miller's jewellery added polish to the overall edgier look.
Eager as ever to emulate her style, read on to shop Miller's latest outfit as well as our edit of the best white dresses and black knee-high boots.
SHOP SIENNA MILLER'S LOOK:
SHOP OUR EDIT OF THE BEST WHITE DRESSES AND BLACK KNEE-HIGH BOOTS:
This pretty linen dress is a summertime favourite amongst fashion people.
Style on its own or throw on a navy jumper if the weather starts to turn.
Style with a white dress or wear with long denim shorts.

Natalie Munro isBest Knockoff Luxury Clothing UK’s news writer and has worked in the fashion industry since she graduated with a degree in Journalism from the University of the Arts London. Natalie’s experience in the industry spans journalistic and styling roles that have seen her work for publications including British Vogue, Conde Nast Traveller, Vogue Ukraine, AnOther Magazine and Elle UK.
With an interest in uncovering Wholesale Replica Bag fashion trends, Natalie takes a leading role in identifying news forBest Knockoff Luxury Clothing UK. Reporting on a daily basis, Natalie focuses on trends on and off the runway, as well as street style and celebrity fashion. Natalie also creates content forBest Knockoff Luxury Clothing ’s social channels including TikTok and Instagram on a weekly basis.
-
My Mom Is in Her 50s and Asked Me for Fashion Advice—8 ChicReplica Store Outfits I Put Together for Her Under $425
Outdated prints and "ugly" shoes included.
-
This Is the Luxe Fall Shoe Trend Every Fashion Person Is Already Wearing on Repeat
Count these inspo pics as proof.
-
The Fall Shoe Trend Everyone in Paris Is Wearing With Black Leggings to Runway Shows and Dinners at Chez Janou
Hint: It's not sneakers or ballet flats.
-
I Live in NYC—These Are the 8 Anti-Trend Fall Pieces That Always Get Me Compliments
From everyday loafers to preppy polo sweaters.
-
*Not* Ankle Boots—the Rich-Looking Shoe Trend That's Quietly Taking Over for Fall 2025
Shop the style inside.
-
Cozy Cashmere! Sleek Suede! Dark Denim! 32 Affordable Fall Pieces You'd Find in a Wealthy Person's Closet
Oh, did I mention they're under $250?
-
Goodbye, Sweetheart Necklines: Kirsten Dunst Wore the Pretty Wedding Dress Trend Brides Will Prefer in 2026
Stunning.
-
Spotted in Ibiza: Dua Lipa Wore the Provocative Dress Trend That'll Still Be Relevant in 2026
Guaranteed.