In the fairy tale Cinderella, the prince tried to find Cinderella by seeing which lady in his kingdom's foot best fit a glass slipper she was wearing the night he met her.
This card's effect could reflect the glass slipper's part in the story. "Cinderella" gains ATK when it is equipped with this card a second time and any other monster equipped with this card will lose ATK. In the tale, the glass slipper fitted only Cinderella and the glass slipper did not fit any other lady besides her. Also Cinderella lost the glass slipper when she left the ball and this card equips itself from "Cinderella" to another monster after the former attacks and inflicts Battle Damage.