Any advice on how to pass as male in high school?

Buy baggy shirts & sweatshirts. They help to make your chest less noticeable, and they're comfortable. Have a male friend go shopping with you to help you pick clothes if you've never bought anything in the male sections before. Also, if you have long hair you may want to cut it shorter. I've realized that people have stopped misgendering me since I've cut my hair short. If you bind, don't over do it and wear a binder all day, everyday at school. Also, don't try too hard to seem 'masculine', be yourself. In some high schools you're able to talk to a counselor about your issue and you might be able to go by the name of your choice during school after a while.

Sorry if I didn't really help much.