How does the Fantasia item work?

[TeraRamis]

Really, if it's only minor things about your character's appearance (such as hairstyle/colour), the aesthetician option is a better alternative, as you can use that as much times as you want in the game, although it costs gil to do so.

Skin color, hair color, eye color, and tail shape are all on the chopping block. I'm not going to make dramatic changes, but I am a stickler, and am wholly unsatisfied with how I currently look. I have heard about the Mogstation item as well, but I'd prefer just to get things right the first (or, really, second) time.