A ripping noise

RRRIIIPPP!!!

"Oh, no!" Sandry wailed, her head still in her locker.

"Ooh, I saw that coming." Robyn's voice came from over her shoulder, "I knew those trousers wouldn't last."

"How badly are they ripped?"

"Bad enough that I can see you have not just Harry Potter knickers, but you've decided you're a Hufflepuff."

"They were part of a set." Sandry explained, reaching back and holding a hand over the split rear seam of her grey trousers, and the black and yellow knickers with a badger design which were now revealed.

A bell suddenly rang out.

"Come on, we've got to get to the next class." Robyn said.

"Wait, I need to find my PE kit so I have something to wear!"