How would cutting off at the waist change the animation? Characters don’t have separate animations for pants vs robes
Robes are 3D models with a texture applied to it. When you talk about animation you seems to think that every single robe in the game has its own animation. They don’t.
95% of the robes share the same 3D model and re-use the exact same animation rig. Plus robes are already in 2 parts. Look at my skirt. It’s a full robe but I’m just using the bottom part of it.
Hiding the bottom or top part would be simple and has absolutely zero impact on the animation.