I've been looking at the rainfrog website for a while - attracted by the fact that their coats are waterproof but also fully lined with cotton (rather than the usual polyester which just makes me sweat). They're pretty pricey though (for me, anyway) so was just wondering if anyone has one and has any comments - good or bad - about them? Also, how does the sizing come up? I'm usually a 12 on top but would want room to layer up underneath when its really cold. Thanks 