The weather in San Francisco always keeps you guessing. Somedays we get a break from the fog and wind and it may even feel like summer, but other days it could almost be winter! That's why I was so excited to see this great "Wear Now, Wear Later" series from J.Crew in my inbox this morning. Except in San Francisco, I could wear them one day after the other. What is the one piece of clothing you're relying on to take you from summer to fall this year?