Since I can’t get the drabble like I want, I’ll just share this headcanon.
Hinata texts Sasuke during his class, or rather…his midday nap, telling him that she felt horribly uncomfortable in the new uniform they were given. Her skirt was much too short and revealing, especially with her body type.
Sasuke gets up without a word to anyone or the teacher. After going to his locker, Sasuke met her at the girls bathroom. In his hand in a black gym bag. He tosses it to her, “There are some sports pants in there, just tell them you had an accident or something.”
Hinata nodded and went to replace the flimsy cloth with his soccer pants. Sasuke yawned and told her that he was skipping the rest of the school day. She didn’t protest.
"I’ll take notes f-for you."
He gives her his school hoodie because he doesn’t like how her shirt is fitting and, “I’ll hate to fight some pig for staring at you the wrong way, get it?” Hinata giggles just as the class bell rings. Sasuke disappeared in the crowd and Hinata is just thankful for him.