This smocked dress from Reese Witherspoon's clothing brand, Draper James, seems perfectly suited for the holiday season. It's very lightweight, though, and is not lined, so definitely wear a jacket when out and about in winter. It's been so cold in Atlanta the last few days -- and the temperature is only dropping from here!
The dress seems to be sold out, but you can find other plaid options online.
Shoes: SJP by Sarah Jessica Parker Guest Bow Pumps (no longer available)