It's the dead of winter—also known as the time when any clothing item that's not optimised for comfort and warmth gets tossed by the wayside. If leggings and Ugg boots sound like pretty much your ideal outfit combination right now, Sienna Miller has a styling idea for you. Photographed in New York City, Miller bundled up in an oversized parka, blue leggings, and Uggs. If you're currently wearing too-tight jeans and heeled ankle boots, Miller's comfy look might spark more than a little bit of outfit envy. And she's not the only fan of classic Ugg boots—Adwoa Aboah, Issa Rae, Rihanna, and other celebrities are also onboard. Scroll down to see how Miller wore the impossibly easy outfit and shop similar pieces for yourself.