Use the jacket for extra cover of her lower body.

(chapter originally by Phantom Pen on writing.com)

The idea of having nothing to cover her upper half except her bra wasn't at all pleasant to Chihiro, but the idea of exposing her intimates was far worse. At least the bra covered the most important parts of her chest, after all. So, carefully, Chihiro draped her ruined jacket across her lap, planning to quickly wrap it around her hips as soon as she left her seat. With this ready, Chihiro curled up to make herself as small as possible before timidly raising her hand, hoping to get the teacher's attention.

Thankfully, it wasn't long before the teacher noticed Chihiro's hand and walked up to the quiet girl's desk.

"Yes, Fushimi?" the teacher whispered, apparently not noticing Chihiro's blatant state of undress quite yet.

"Uh... I... I... I need to step out of the room. My... my uniform..." Chihiro stammered, unable to continue speaking as her face quickly turned crimson.

The teacher's eyes widened as she realized Chihiro's problem. Looking around to make sure the rest of the class was still focused on their work, the teacher bent down to close the distance between herself and Chihiro.

"Fushimi, what on earth happened?!"

"I-i-i-it's a long story." Chihiro said, unable to make eye contact. "I just... I just... I can't let anyone see..."

The teacher put a reassuring hand on Chihiro's shoulder, though this only served to make the poor girl flinch from the contact. "You'll be okay, Fushimi. I'll make sure everyone keeps their eyes on their work, and you can slip out. Go take care of... this."

Chihiro couldn't put her relief into words, so a look of gratitude would have to suffice. The teacher walked back to the front of the room, gave Chihiro a reassuring nod, and faced the students.

"Eyes on your work, everyone. I don't want to see any wandering eyes, understood?" The teacher said, putting forth an air of authority. Chihiro didn't need a signal from the teacher to know this was the time.

Clutching the jacket around her waist tightly, Chihiro quickly slid out of her seat, wrapping the ruined garment around her shapely hips as she stood up. Not wanting to waste time, Chihiro hurried to the classroom door, sliding it open just enough to squeeze through and slip into the hall.

Chihiro knew she had to get somewhere safe. She wasn't sure where, but the hallway certainly wasn't the best place to linger. Anywhere that wasn't a classroom, that much was certain. Hopefully she could find something to restore her modesty, maybe even a replacement uniform!

Unfortunately, Chihiro's plans hit a snag as she and the teacher hadn't noticed-