[header] How to not get cold wearing a t shirt in winter [title] Prepare for how cold it's going to be. [step] Check a thermometer for the temperature before you go outside. When you know what the temperature is going to be, you can mentally prepare for how cold it will feel. 
[substeps] If you're planning for the future, check a weather service to anticipate how cold it will be, so you can gradually allow your body to get used to the cold. Keep in mind what the wind chill is before you go outside.