My mom won’t let me switch underwear

How do I get my mother to let me switch underwear. I hate having pantie lines in my leggings. I’ve asked her to let me switch. She says no.

I’ve gone to the length of buying them myself. I’m 16 I should be able to make a decision for myself but she threw them out.

Any advice on how to get her to give into mine wanting to switch to boyshorts or thongs.