At a star-studded event in Los Angeles on Wednesday, the auburn-haired actress further established herself as a fashion industry heavy-hitter with another standout red carpet look.

The 27-year-old Stone arrived at the Chateau Marmont in one of her chicest ensembles to date–a silver-and-white melange of sophistication and daring. The Oscar-nominated actress paired a gray ruffle-bearing floral pencil skirt with a set of strappy silver sandals and a plunging white button-up shirt.

Subtle yet statement making, Stone’s true shining sartorial moment involved what she wore under the bold top–a gray patterned bra that matched her mid-calf-length skirt. The floral undergarment was just visible beneath her blouse, and Stone upped its intensity by leaving a central button undone to expose just a hint of the delicate bra.

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Stone’s vivid bob offset the neutral tone of her look and gave her outfit a splash of autumnal warmth.