Final Fantasy XIII L'Cie Crystalization

In this world, certain characters are made into L'cie, people given special powers to fulfill a focus and after that, get turned into crystal. Characters who get crystalized include Serah, Dajh, Lightning, Hope, Snow, Sazh, Vanille and Fang. Vanille and Fang in particular were turned twice, in crystal sleep for hundreds of years before the game began. Also, when characters are crystalized, they turn naked... for some reason.