I Think This Is Sienna's Best Outfit of the Year, and It's All Down to This Chic Jacket Trend
According to Sienna Miller and Fashion Editors, cinched-waist leather jackets will be autumn's favourite buy—these are the best ones out there.
If my time in the fashion industry has taught me anything, it’s that when Sienna Miller backs something, it won't be long until it becomes a cult-worthy buy. So this week, as the actor stepped out for one of her many press appearances for her film War, she put me onto a jacket trend I’m now convinced will be everywhere soon.
Stepping away from her usual boho sensibilities, Sienna opted for a sleek, modern look, championing a leather jacket silhouette I think is about to take off. Her cinched-waist style featured strong shoulder pads, a glossy leather finish and a broad collar that borrowed from the traditional biker jacket silhouette.
Styling Balmain's Signature Leather Jacket (£3590) with the French label's Low-Waisted Wool Satin Trousers (£1090), Sienna's all-black look created a sleek, wearable foundation that let the details of each piece shine. The jacket's cinched waist, for example, created a contoured silhouette, bringing shape and elegance to her otherwise unfussy outfit.
Whilst a black leather jacket will never go out of style, each season tends to bring a fresh take on the classic silhouette. For autumn/winter 2026, oversized proportions, cinched waists and strong shoulders are the details to know.
Having already found a comfortable spot in Sienna's rotation, I also began spotting the silhouette on a handful of well-dressed editors during London Fashion Week this past weekend. What's more, key high-street retailers have already started stocking the style, H&M included.
So, if you're in the market for a new autumn layer, I hope I've made a case for this one. Read on to shop the cinched-waist leather jackets I'm recommending below.
Shop Cinched-Waist Leather Jackets:
Shop the exact leather jacket that Sienna loves.
This is new in stock, but I can't see it staying around for long.
I'd easily believe you if you told me this was designer.
Whilst I love this in the dark brown, it also comes in burgundy.
Style these with black tailored trousers for a sleek, minimal look.
The funnel neck jacket trend won't be going anywhere anytime soon.
This chic leather jacket also comes in brown and burgundy.
Be quick! This is on its way to selling out.
A boxy leather jacket is all you need to create a sleek, elevated look.
