Cooler evenings have finally returned, meaning your comfortable jeans can come out of hiding. However, after weeks of shying away from trousers, I can admit that I’m in need of a few pointers when it comes to styling denim. Thankfully, Sienna Miller’s recent jeans outfit formula is the perfect look to emulate for summer evening occasions.
Stepping out in an asymmetric linen top by label SIR, Citizens of Humanity Pacifica Miro Taper Barrel Jeans, and Givenchy heels, her effortless combination of soft, neutral tones with hints of texture prove how easy it can be to make loose denim feel elevated.
The barrel leg silhouette is a key denim trend for 2026, and breathable linen will never be out of place in a summer capsule wardrobe for both casual and more formal occasions. Dressing up slouchier bottoms with a structured top and statement heels is a shortcut to an outfit formula that offers both timeless appeal and a smart-casual edge with minimal effort.
Copy Sienna’s exact look with her choice of barrel leg jeans with a flattering high-rise fit. Some of the best barrel leg jeans, this premium denim brand is loved by A-listers.
These are the exact shoes Sienna wore, and they’re currently on sale. The neutral colourway makes them easy to wear with wedding guest dresses or jeans.
With a similar hue to Sienna’s top and a gorgeous asymmetric cut, this Nobody’s Child top is a summer investment that will take you anywhere.
With a similar feel to Sienna’s top with a little more coverage, this versatile light knit can be paired with any colour palette.
M&S denim is some of the best on the high street, and this barrel shape is extremely similar to Sienna’s pair, and a fraction of the price.
With the same bow detailing as Sienna’s shoes with a gorgeous satin finish, these can be worn for any formal occasion whilst remaining easy to style. The slightly lower heel adds stability.
When it comes to styling loose jeans, balancing your silhouette with a structured top works to make denim feel both intentional and polished. But what makes Sienna’s look so chic is the asymmetric cut of the top, which adds interest to casual bottoms and offers a dressed-up take on a simple outfit formula.
Tying the twisted sleeve in with the bow detailing of her heels creates cohesion amongst the blue hue of the jeans, as well as introducing some texture to make the outfit more dressed-up for the evening. In your own wardrobe, opting for a top and shoes in the same colour family or with similar detailing will be a shortcut to an outfit that will take you from AM to PM.
Whilst these jeans can easily be worn with a white tee or oversized shirt and comfortable trainers during the day, a fitted, structured top and kitten heels instantly make them occasion-ready.
