Not sure how deep this engine limitation buried within Skyrim SE/AE; but maybe, it is possible to patch?
Description of this problem: if given the mesh with 81 or more bones (for example, LE mods of chinese dresses with physics run through NIF Optimizer), this part of mesh that skinned on bones #81, #82. will start stretch to presumable 0,0,0 coordinates of the world.
Can be fixed by separating mesh pieces into smaller parts each, where each part contains 80 or less bones.
Problem does not exists in legendary edition, hence why all those 100+ bones outfits exists
COCO Bloom Youth legendary edition mod on nexusmods, if you need examples, can be easily downloaded and contains skirt with 178 bones.
Not sure how deep this engine limitation buried within Skyrim SE/AE; but maybe, it is possible to patch? Description of this problem: if given the mesh with 81 or more bones (for example, LE mods of chinese dresses with physics run through NIF Optimizer), this part of mesh that skinned on bones #81, #82. will start stretch to presumable 0,0,0 coordinates of the world. Can be fixed by separating mesh pieces into smaller parts each, where each part contains 80 or less bones. Problem does not exists in legendary edition, hence why all those 100+ bones outfits exists COCO Bloom Youth legendary edition mod on nexusmods, if you need examples, can be easily downloaded and contains skirt with 178 bones.