Belle's dress was decorated with about 2,160 Swarovski crystals,and according to actress Emma Watson, the costume designers created it so it looked like it was floating as Belle and Beast danced.
Belle 
服上装饰有约 2160 颗施华洛世奇水晶,据女演员 Emma Watson 说,服装设计师创造了这些水晶, 这样,在 Belle 和野兽跳舞时,它们就会像是悬浮在空中。