What does peter do to his clothing that initially shocks anne in the diary of anne frank?

Okay, this guy is actually Peter van Daan. But he's a little bit like Peter Pan-he's mesmerizing, innocent, and more than a little reluctant to grow up.

It's not as though we blame Peter-whose actual name was Peter van Pels-for his immaturity. The situation he finds himself in is so horrific and claustrophobic that it makes sense that he'd prioritize getting through the days instead of bettering himself.