When she received detention, Lauren Wiggins writes an articulate letter about why her clothing choice, seen above, is meant for her comfort and not for the sexual viewing pleasure of her classmates. For that, she then received a 1 day suspension. I wish I had half her confidence and eloquence at her age (and mine).
How to deal with a bully? Meet with the bully's parents, pretend that you work with child services and then give them a long speech about how you deal with families like theirs and that "this is how it starts" and offer advice as to how they should discipline their child. This is a "hidden" threat. Obvious threats have a habit of producing a result opposite of what you want (you want them to comply, not resist).
Read Kate Winslet’s Speech About Overcoming Bullies to Make It in Hollywood | Vanity Fair