Because of the colour and the style. A few days ago I discovered that there's a story behind "Masquerade waltz": a man is going to kill her wife and that is her last dance. So I understood why Mao wears an evening dress. But even so, it's not the right dress because I think the music is colourful. I live near Venice and I have a "colourful" idea of a masked ball, for the Carnival of Venice, you know. The music suggests me something red or purple. So the power of the music would be more expressed to the audience. When Mao did the encore after NHK Trophy, skating the step sequence with the exhibition dress, it was much much better