In cold days in SA which btw are quite scarce, I used to make in winter a tea with Stroh rum containing 80% alcohol. It worked well and here I would also advice a bit of spirit. In healthy body unhealthy (80%) spirit some might claim but it had worked miracle

Truly Sada claims that most of the heat is lost in legs. Warm socks and boots but don't forget to cover your head. Warm jacket and a better half wrapped around you makes your body temp maintained in a peak level