Lifehack for keeping warm
People think that one thick layer of clothes, like a heavy or baggy sweatshirt, will be warm enough. Actually that’s not quite true because there’s only one layer and it may not trap your body heat properly.
A few thin layers will keep you warmer because the layers trap more body heat. That’s why you have sheets, a blanket and then a duvet or comforter on your bed.
So you could wear a tank top, a T-shirt or thin long-sleeved shirt and a sweatshirt on top, and you’ll feel more comfortable because less cold air can get under the layers.
Sometimes just a tank top under a sweatshirt is enough, but you may need another layer between the tank top and sweatshirt if you still feel cold.
Dressing in layers is also helpful because you can take a layer off if you get too warm and still be more or less decent to be seen in public. :P