(Note: I have graduated from High School)
My old high school does not have sweatshirts /sweatpants/gear that has the school's emblem, made just for the sports teams. Instead the team members create them on a probably-not-safe site AND pay $50-$70 for clothing that might fit but probably wont.
I also don't see the problem with wearing a non-team related sweatshirt (like a blank hoodie or college or something). I honestly don't.
The high school should just make some and sell if for $40 (all sizes) considering that my sister has to also pay for other things that might happen on the team.
