The Puffer Trench

Every year when fall comes around, I am shocked by how cold it is. Summer and time does a good job of fading away memories of the bitter cold and biting wind. Walking around, people are pulling out their trench coats against the cold. But is that enough to keep us warm? It IS only made out of a layer of cloth (or two, counting layers) after all. I own one and I don't find it very warm at all.