While it may seem that pajama dressing is inherently casual, details like eye-catching ostrich feathers, red platform heels, and a printed yellow belt add polish (and a punch) to Sienna's look and make it a red carpet success. And while you might usually shy away from mixing so many bold colors, navy and black make for the base of the look, so little jolts of color don't feel like too much. If there's one thing to learn from her, it's that fashion rules are meant to be broken.
Read on to see Sienna's look and shop feathered pieces inspired by her ensemble!
Michael Stewart/Getty Images
On Sienna Miller: Prada pajama top and pants; Prada belt.
The style setter made pajamas feel fancy enough for the red carpet in this feathered look.