The teacher says that he'll let her have her hair down while he's there, so long as she's dressed up in a cute costume. She's so excited that she can't wait to get dressed and go out. The teacher's not happy about it, though, because he thinks that the costume will make her look like a seductress. He's also worried that if she lets the tail out of the dress, people will see her underwear. Uh-oh.