Her jeans get caught

Marinette didn’t realize that the back belt loop of her shorts got hooked onto the open locker door until it was too late.

As she took a step forward, away from the locker, her belt loop pulled her back, causing her to slip forward. The rip grew until it reached the edge of her waistband, as her jeans split further up the front, breaking her zipper, and splitting her shorts in half.

At this point, she was essentially hanging from the locker from her belt loop. In a panic, she tries to get back up, only to slip again, causing another rip to form on her thigh. The more she struggled, the more it grew.

She tried grabbing onto the locker to gain balance, but slipped, causing the left side of her pants to fly right off as she stumbles backwards. Her remaining pant leg slid down her thigh, down to her ankle, leaving her underwear completely exposed.