The hoodie, obviously

As much as you wanna pull down your pants and underwear, that wouldn't go with the good girl act. Neither would removing your bra. And it'd just be weird to take off your shoes for no reason. So you excuse yourself "sorry, Ms. teacher, it's hot in this room, can I please remove my hoodie?"

"Go right ahead", says the teacher.

It's an innocent enough sounding thing to do. If only your teacher knew what your ultimate plans were she might not be so quick to agree.

"The lockers are...", the teacher starts. But you interrupt her by just whipping it off with all eyes on you. "...never mind."

It was just a hoodie that was removed. That's all it was. But, doing it in front of the class as everyone watched was just a little bit sexy. The boys seem to agree with that assessment as they start paying more attention to you as soon as you do that.

"Which way were the lockers?", you ask.

"Just out in the hallway to the left.", she answers.

You decide to hang up this article of clothing in the locker. It's the only one you want to keep safe. Everything else can be torn, stolen or burned for all you care. You put the hoodie away and get an idea.