In the Winter, I am a big vest fan. Especially when getting active because it keeps my core warm while letting my arms breath.
It's always an added bonus if I can find a vest with a hoodie, so I am loving this Whisper Vest ($139) by Isis. Made from 650-fill powder goose down, it keeps you warm when it's on your back, but it's still light enough that you won't feel weighed down. Perfect on its own on cool days and evenings, or even under a shell when you are planning a long day of running, hiking, or snowshoeing this Winter. I am also loving the fun color combinations. Buy it here.