Do you partake of wintertime recreation in the out of doors? If so, and especially if your recreative choices involve aerobic activity, I highly recommend your immediate and unquestioning acquisition (preferably through exchange of cash or credit, though thievery might be warranted) of a pair of Craft tights for use in your en plein aire endeavors.
Though the ones I have are a bit different from the ones pictures, boy, these babies are windproof, fleece-lined, light, warm, and black. Worth every penny (and therefore worth even more if you can get them, as I managed to, for two-thirds off.)