What do you wear in the winter time for track practice?

Honestly it's my first practice in the winter and I have no clue what to wear lol. I have sweat pants but idk if running in "baggy" sweats is a problem. I plan on wearing some winter leggings with a loose fitted jacket, but I'm not sure if I'm supposed to wear loose clothes. Are my clothes supposed to be fitted? So all I wanna know is, is wearing leggings and a loose fitted jacket ok for the winter, or is there more that comes to this :/ thank you to the person gives a sincere answer ❤