No One Does Boho Quite Like Sienna Miller—5 Staples She Relies On Every Summer
I must admit that I think this summer’s fashion is the best in years. Sure, I adored the soft butter-yellow hues that danced over dresses and blouses last year, and pretty bloomer trousers were a revelation for comfort and style, but in 2026, the fashion set's wholehearted embrace of boho has me completely captivated. Be it whimsical broderie anglaise tracing the bodices of blouses or voluminous balloon pants that feel straight out of the ‘70s, the free-spirited attitude is everywhere. And tell me, who's better suited to lead the charge than Sienna Miller?
The patron saint of modern bohemia, Sienna Miller has perfected the undone ease of the aesthetic since the early 2000s. Think billowing babydoll dresses styled with belts and skinny jeans, or floaty minis finished with wide, studded belts and knee-high Chloé pirate boots (and lest we forget the studded cowboy boots and vintage vests she traipsed around Coachella and Glastonbury in). In fact, looking through her archive, almost all of the pieces would feel at home within the capsule wardrobes of many fashion people this summer.
This week, feeling nostalgic, I looked back through the wonderful street-style images Sienna has provided us with over the years and pinpointed the pieces she wore over and over. Thus, the ultimate Sienna Miller summer capsule wardrobe was born.
The Ultimate Sienna Miller Summer Capsule Wardrobe
1. Your Best Dress
Style Notes: Whether she's jetting off to the Cannes Film Festival or attending the hottest parties in London, Sienna rarely spends a summer day without a dress. Be it a floaty Chloé maxi trimmed with frills or a structured, shirred mini whilst courtside at Wimbledon, she leans into playful details and neutral colours to give her signature boho zhuzh.
Shop Maxi Dresses:
Halternecks are everywhere this summer.
Whilst sold out in her cool cream shade, Chloé still has Sienna's exact dress in a pretty sage green.
Dôen makes some of the best summer dresses on the market.
You can never go wrong with a stylish drop waist.
Style with strappy sandals and a raffia tote this summer.
2. Dutiful Denim
Style Notes: No summer capsule wardrobe is complete without a trusty pair of denim jeans—Sienna Miller's included. Swapping her '00s-style skinnies for far looser silhouettes, her relaxed jeans have a throw-on-and-go energy that's ideal for warmer weather, and they pair seamlessly with the loose tanks and pretty blouses she typically wears in the summer months. Bonus points if you go for a white pair with a brown belt.
Shop Denim Jeans:
These look almost identical to Sienna's.
These come in 23 colours!
Size up for a looser fit.
A Who What Wear UK editor favourite.
Zara makes some of the best high-street jeans around.
3. Luxe Lace
Style Notes: Sienna Miller and Chloé are a match made in heaven, so naturally, silky-soft lace-trim skirts feature heavily within her summer capsule. Whether styled with a tough leather jacket and wooden clogs (as seen above), or finished with a matching blouse and sophisticated heel, it's a piece that will keep you cool as you float from day to night.
Shop Lace-Trim Skirts:
Keep it simple with ballet flats and a tank top.
This has been all over my socials this summer.
The lace underlay is a nice touch.
If you love lace-trim shorts, you need to see this skirt.
Another stunning Dôen find!
4. Pretty Blouses
Style Notes: What's summer without a pretty blouse? A staple in Sienna’s rotation for decades, they lend a romantic, airy finish to the denim cut-offs and T-bar sandals she typically wears in warm weather.
Shop Blouses:
If you like this M&S gem, I'd be fast, as it's selling quickly.
A classic.
No one does vintage-inspired fashion quite like Rixo.
Style with bloomer shorts this summer.
This is exactly how I plan on dressing this summer.
5. Make It Mini
Style Notes: Yes, she loves a boho-style maxi, but Sienna doesn't discriminate against minis. Be it distressed denim styles paired with practical cowboy boots at Glasto or sleek lycra styles finished with preppy polo tops and chunky heels (see above), she's been making a case for the abbreviated hemline since the early noughties. And honestly, I’m so here for it.
Shop Miniskirts:
A fashion person's favourite.
If you're looking for Miu Miu on a budget, Guizio is the brand to know.
I'm obsessed with brown and pink this summer.
I wear this skirt at least once a week.
Just remember to wear dark knickers.
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