Honestly, if we believe that children should be spending time outside every day (and they should), then you should also be prepared for it. I am a big believer in layering for the cold, but for years I kept saying that I should buy a set of winter overalls. Finally I went to the local farm supply store (during their after-season sale) and bought a pair of overalls for a reasonable amount. I have never regretted it. They zip right over my teacher clothes and I am as warm and toasty as the children.