It was taunting her.
She should really be listening to McGonagall talking about minks or whatever the class had moved on to.
But no, that tiny scrap of material was annoying the hell out of her, and she couldn't concentrate. If only she could just lean forward and tuck the tag into his shirt, she'd be okay. She glared at the back of his neck.
Tags and inside out hoods - they were what got her. More so when she couldn't to anything about it.
She could probably do it without McGonagall noticing. Reach forward for a few seconds and tuck it in. But that would undoubtedly catch his attention, and she couldn't risk that. He was Potter and she was Evans, and their relationship wasn't like that. There was a strict no contact policy in place, and she wasn't about to go and abuse that.
Transformation of animals is difficult, especially when transforming one species into another, as opposed to... Her quill scratched ink onto her page. She glanced up at him again, and immediately lost her concentration.