Wearing underarmour by itself?

kk well im a girl and i have a white underarmour long sleeve shirt. Its the really stretchy tight kind and i was wondering if its ok to wear alone (without a shirt over it) with sweatpants either for softball practice or to school on days I have games. I like how it looks sporty, but not really baggy, but does this look weird? its ok if you think thats horrible but i need some opinions. (its still really cold here and today we had a game when it was windy and 35). Thanks :D