Uniform Stealing Board

A young woman needs to escape a crowded household during a celebration. Luckily, there are some dancers at the event. The woman follows one of these dancers to the bathroom, then knocks her out and steals her dress. (Unfortunately, the only version of this episode I can find has some bad English dubbing.)

Starts at 6:05, knockout at 7:25. Discovery at 12:10.

https://www.youtube.com/watch?v=UFXVe87xmmQ