Im a big guy (17 btw)and i hate feeling insecure about my outfits (that i wear outside of school) in school.

Like when i go out with my friend it my mom, i dont care how i look when i wear a what i think to be, a nice outfit. But i hate it so much and i feel more insecure in school. I know in the real world, people dont care about your outfits or whatever, maybe sometimes youll get people you walk past in stores saying “oh i like your outfit”. But in school, its a different scenario. For the outfits i wear, i get bullied, not because of the way it looks or the outfit itself, but because “i cant fit into them” or “im too big” and i feel like i need to wear hoodies all the time going to school so people can lay off (because hoodies have thicker layers and you cant see much with the thickness) and i wear a overcoat around them so it can hide my belly/any fat around me. I hate having to wear a thick, heavy overcoat when i go to school wearing a really nice outfit because it just gets rid of the point of wearing it. But everytime i wear it, its, like i said, “too big on me” when i think it looks fine. I just hate being too insecure to wear i need to wear hoodies or overcoats around them.