Casual, sporty style is abundant in Pearl Izumi's Women's Beakay Vest. It's a medium-weight top that's always there when you need to throw on something quick, and it's also great worn as a layer. The plush Thermal fleece-backed fabric feels great and holds warmth well. There's also a full zip with draft flap and a tall collar to seal out the chill.
This manufacturer's chart helps you evaluate the fit (may show unavailable, and/or not all sizes).