Long sleeves and long underwear/leggings, two pairs of socks, flannel-lined jeans if you have them, sweatpants and jeans on top if not, flannel or similar overshirt, scarf(!), sweater/sweatshirt, winter coat (or 2 additional sweaters/sweatshirts and a raincoat or other large windbreaker), boots, gloves, mittens, and hat.
You won’t die, especially if you move around. I’ve had to take the coat off while shoveling in those temperatures, though my feet and hands were unhappy after a while. Definitely have a cup of hot liquid when you get back inside though.
I’m an American immigrant married to a German, and it definitely took us a bit to adjust to each other’s feedback styles- he thought every dish he made was my new absolute favorite, and I thought he disliked my cooking at first, because I’d say something was delicious and he’d say it was fine, lol.
But I’ll take it, because this way Germans think I’m quick witted when I respond with that.