Margot and Sienna Confirmed That Baggy Double Denim is the Style of the Moment

If I trust any two people to take my spring/summer styling inspiration from, it has to be Margot Robbie and Sienna Miller. Having both spent years working with big-name brands and in-demand stylists, the two have cultivated chic and distinct wardrobes that emanate elegance and an undone ease.

So when they both back the same trend, within a day of each other, no less—you know it’s worth paying attention to. Stepping out in London this week, the two put their weight behind the oversized double denim co-ord trend—and I’m inspired.

Leaning into the relaxed nature of the casual denim trend, Robbie styled her set sans excess accessories, selecting a simple black shoulder bag to add a point of polish without overcomplicating her styling.

Meanwhile, Miller attended an event in London, layering a long-line denim jacket in a boxy, oversized fit over a pair of wide-leg jeans, complete with a sheer, printed blouse. Using accessories to enhance her styling, Miller selected a supple suede bag, a square buckle belt and brown Gucci Suede Horsebit Ballet Flats (£695) to complete her day-time look.

After making waves on the spring/summer 2025 runways in September, oversized double denim has solidified its place as a fashion frontrunner for the warmer months. Chanel, Stella McCartney, and Gabriela Hearst were among the brands championing the trend, styling their denim pieces in a notably undone manner that expressed a move towards nonchalant cool.

Model wears baggy double denim on the Stella McCartney spring/summer 2025 runway.

Beyond the runways and celebrity circles, the trend has already gained traction among Instagram’s most stylish. Styling their sets with pointed-toe heels to add some structure and height, or going all-in on comfort and styling them with rounded-toe flats for a simple silhouette, this oversized look is proving its versatility this season.