As the first inklings of true fall weather inch closer, opting for a richer hair color seems only fitting to reflect the seasonal shift. Ushering in what’s sure to be a wave of new celebrity ‘dos this autumn, Sienna Miller recently debuted a fresh fiery-red hue, solidifying her status as a hair-color chameleon. (In fact, she makes the shift look so effortless she nearly has us convinced that going red is a piece of cake.) Offset by a cozy ensemble, we’re filing the starlet’s covetable look away as inspiration for the season ahead.