As you can see, it's a mix of the expedition outfit with the modified swimsuit and added physics.

There is a bug with the animation of falling from a great height, To fix it install the AyakaMods - Roll Disabler mod.

Install:
Copy the 3 files to \Clair Obscur - Expedition 33\Sandfall\Content\Paks\~mods

Donations:
https://ko-fi.com/bloody11