Sienna Miller is ushering in the leather boots for fall trend, per her recent appearance at Longchamp’s fall 2025 London Calling party on Thursday.

The actress embodied an autumnal bohemian look with her loose and flowy black dress paired with black Longchamp boots, which established a cohesive monochrome color scheme for the event. Her choice of footwear for the early September day pointed toward the influx of leather boots the fashion industry can expect as the weather cools down — the popular footwear style is a canvas for creativity for a range of brands, with silhouettes ranging from Chelsea boots to thigh-highs.

Longchamp put its stamp on a versatile black leather boot with distinctive linear statements including a square toe and a wide, slender heel, offering an unexpected take on the trusty block heel look. The shaft showcased a subtle slouch as well, a textural twist on the leather boot which designers experiment with to different degrees.

With her choice of clothing, Miller leaned into a look she was known for in the 2000s — the boho aesthetic — with an off-the-shoulder dress featuring puffed long sleeves, a dainty bow tied at the chest and a flowy skirt. While she went with a dark palette for this occasion, the actress doesn’t always go for the all-black look; she recently stepped out in London in blue jeans, a beige button down and glossy red slide sandals, all of which accompanied the Gucci Gilgio bag.

The Longchamp party was also attended by the likes of Alexa Chung, Ambika Mod, Naomi Ackie, Georgia Medley, Poppy Delevingne and more guests. Delevingne also went for a square toe, slender heeled Longchamp boot, though she opted for a neutral tan hue.

Other celebrities with shoe collections ready for fall include Ciara, who recently wore combat boots to the U.S. Open; and Dua Lipa, who wore Miu Miu’s hardware-embellished boots in Kosovo earlier this summer.