Celebrity collections can be a tough thing, but actress-turned-designer Sienna Miller and sister Savannah are hanging in there for their third season at London Fashion Week. Known as a style icon in her own right, Miller seems to be channeling her own trademark downtown cool for Spring, focusing on tough leather and rugged denim with a bit of pretty black chiffon thrown in for good measure. Flirtatiously shrunken and skin-baring pieces balance out denim vests, stiff leather jackets and Rosie the Riveter headwraps for an overall look that feels almost confrontationally cool.

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