Una, that scale is hilarious, especially the thought that it takes a -50F temp to freeze political hot air. That almost makes me long for the next ice age!
But I do have a few suggestions, Jurocha, for helping you stay reasonably warm this winter.
First, hats, scarves, and mitts (not gloves) are non-negotiable when the temperatures fall below -10C/15F. Frostbite is a real possibility, especially if there is any wind. And said items need to be made of wool, not cotton or acrylic. Keeping your head, hands, and feet warm are essential if you don't want to feel cold.
Second, as you've found, layers work, but you have to guard against overheating because perspiration causes dampness which causes you to feel cold and chilled when you go outside or stop moving. If your body gets damp and cold, you'll start shivering which is the first sign of hypothermia, a condition which can actually kill you. Silk and cashmere work because they self-regulate; they will insulate you from the cold when you are outside, but won't cause you to overheat when you are indoors. That's why silk underwear is popular with those of us who walk to work in cold temps but work in heated offices. Synthetic "wicking" fabrics like polypropylene underwear and fleece also work because perspiration is "wicked" away from the skin so you never feel damp. Wool works much the same way and provides a great deal of insulation for its weight. Cotton is not a good fabric choice for cold weather--the mantra of many outdoor people is "cotton kills"; that's probably a bit extreme, but you need to be realistic about when and where to use cotton underlayers.
Third, you need good footwear. Some people like to wear boots with insulation; I've always preferred unlined boots because I don't have to worry about the insulation getting damp which leads to cold feet. I also like to wear wool socks in my boots in winter, not cotton or nylon ones. Smartwool and Icebreaker are two good brands.
Fashion is fun, but freezing isn't. It's possible, though, to look good even when you are bundled up against the winter as long as you are realistic about what clothes need to do to protect you.
