Sienna Miller's Casual Outfit Is Cool and Winter-Ready

last updated 13 January 2023

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We love nothing more than poring over Sienna Miller's impressive outfit archives whenever we could use a fresh dose of outfit inspiration, as her sheer sartorial versatility makes her so darn exciting to spotlight. While some celebrities wouldn't dream of stepping out unless they're entirely made-up and wearing the hottest new pieces, Miller's innate fashion sense is just as prevalent in her most casual everyday wares as it is when she's appearing on the red carpet. In fact, if it's even possible, we find her off-duty looks all the more appealing, as, generally speaking, they're easier for us to re-create.

So if you're suddenly searching for the ideal winter outfit to wear on repeat for the next few months, look no further than Sienna Miller, who was photographed in New York this week in the perfect cold-weather ensemble. Whether your weekend plans involve doing the school run, walking the dog or simply heading to the supermarket to stock up on supplies, Miller had made getting dressed so much simpler with her latest formula—a parka, tapered joggers and Birkenstocks.

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We know what you're thinking—the Queen of Boho in a parka jacket? It might not be the sort of thing that instantly springs to mind when discussing Sienna Miller but that's the beauty of Miller; you never know what she'll wear nexr. Pairing it with some classic beige joggers, a bright beanie hat, and some in-demand Birkenstock Boston clogs, she made this look a little bit unexpected but that makes us love it all the more. And even though she’s currently based in NYC, this casual look shows she really is a London girl at heart. Plus, it also serves as proof that even the most stylish celebs are still just as tethered to their comfy clothes as we are, which is a comfort in itself.

Keep scrolling to browse the pieces you'll need to re-create Sienna Miller's casual outfit this winter.

1. BRIGHT BEANIE

H&M

Rib-Knit Cashmere Hat

A fun addition to any winter accessory collection.

Arket

Double-Fold Alpaca Merino Beanie

Green hues were huge on the spring/summer 2023 runways.

& Other Stories

Ribbed Mohair Blend Beanie

This & Other Stories hat comes in so many bright colours.

2. PARKA JACKET

Isabel Marant Étoile

Gane Oversized Hooded Color-Block Faux Shearling-Trimmed Shell Parka

I'm into the contrast-colour panels on this parka jacket.

Warehouse + Technical Utility Parka

Warehouse

Technical Utility Parka

Ideal for minimalists.

Fortela

Fergie Hooded Faux Shearling-Lined Cotton-Blend Canvas Parka

The faux-shearling lining will keep your extra toasty.

3. NEUTRAL COTTON JOGGERS

ASOS

Curve Tracksuit Neutral Jogger

How sleek is this co-ord?

H&M

Cotton-Blend Sweatpants

I buy almost all my basics from H&M.

Pangaia

365 Track Pants

If you have the budget, this Pangaia pair are second to none.

4. BIRKENSTOCK BOSTONS

Birkenstock

Boston Suede Flat Shoes in Black

Influencers, editors and celebrities can't get enough of Birkenstock Bostons.

Birkenstock

Boston Suede Flat Shoes in Taupe

This taupe pair keeps selling out.

Birkenstock

Boston Suede Flat Shoes in Mocha

Brown hues are huge for 2023, so this pair would be a sound investment.

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Maxine Eggenberger is Who What Wear UK’s deputy editor and has over thirteen years of experience in fashion journalism. She been creating engaging and elevated style content specifically for Who What Wear UK since 2018, covering runway reports, emerging trends, long-form features, self-styled shopping stories and columns, including her edit of the best new-in buys. She ensures the highest editorial standards are met across the site, leads the editorial team in their SEO strategy and keyword planning, works closely with the beauty team on content initiatives, represents the brand at industry events, and regularly contributes to social media, including her own Who What Wear UK TikTok franchise, French Style Fridays. Previously, Maxine appeared on ITV's This Morning in her own fashion segment and has interviewed countless celebrities—everyone from Victoria Beckham to Oscar winner Lupita Nyong’o.

Prior to Who What Wear UK, Maxine’s career began when, after completing her first-ever internship at Look magazine, she was offered a position on the brand's fashion desk. She accepted, leaving university a year early in the process. Her passion and natural talent for writing and styling meant she swiftly rose through the ranks to become the title's fashion news and commercial content editor, with a stint as InStyle.co.uk’s fashion and beauty writer along the way. She later served as Look’s acting Editor in Chief, overseeing both print and digital, before embarking on a successful freelance career, working with Grazia, The Pool, and Marie Claire amongst others.

Maxine is based remotely from her countryside home near Edinburgh where she spends her downtime renovating her house, walking her dogs, hosting friends and trying to master the art of making Old Fashioned cocktails.