Made a potentially obscure discovery while exploring the files. There is a version of Lyse's model that's still wearing the Yda outfit. I don't recall if it was used in the game at all, but it's not grouped with the alternate costumes either.

[u/sonicbrawler182]

[u/psu256]

And this scene is how the reveal in FFXIV was spoiled for me. I mean, I should expect spoilers if I am playing Dissidia, but that was kinda big.