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 o

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