I think it's awesome having powers to communicate and hear dead people... Does it? 0_0 I had to see what Vanille thinks.
Anyway, as for the fashion and outfits, I think if all cast members of LR were to wear many outfits as much as Lightning, the game would become a fashionista based video game and not what it's intended to be, the final chapter of FFXIII, and it should not get distracted with high levels of fashion. And as the only playable character, Lightning should be the only one with numerous outfits.