Costume Room (Idea)

I'll be honest when I say I have no idea what you did there. It looks amazing though! Just a few questions:

Is that FFVI Advance, and can the sprite be changed in normal FFVI?

Would you be able to switch back and forth between these sprites?

What did you use to edit and implement that in?

And as a general one, what program should I download to play FFVI and eventually hack it?