She staples it together! Hopefully holding the skirt on.

Out of pure desperation (And being very late for school,) Anna grabs the first thing she sees on her living room table which so happened to be a stapler.

Anna pulls the skirt up her legs and staples together the two parts of unjoined fabric. but on complete accident anna made the skirt too tight with the staple. Anna soon realised that if she moved in any sudden way the staple would most likely break and re-expose her.

"whatever it doesn't really even matter" she said aloud to herself. "I don't honestly think I'll have to move too fast in school anyways."

With that Anna grabbed her keys and book bag and drove to school.