What does it mean to exchange old clothes for new clothes? _ The meaning of old clothes

Changing your old face into a new one means changing your old face immediately.

For example, a person used to be sloppy, but after changing, he becomes sunny and handsome. This state can be called a makeover. In other words, he has changed his former appearance, maybe he has changed his bad habits. You can also simply change your previous appearance and temperament.