actually you can also just separate by materials and then just click one of the parts of the skin that shows and delete that, it's separate from the rest of the legs
I'm pretty sure "DONT LOAD.fbx" is the model, if you just put that in blender and use cats to separate model and then remove the faces of the legs under the stockings (in edit mode), and then connect again it should be fixed. U don't need to separate model tho u can do it withoutno offense nuclear but you should probably do that and update the model so the leggings dont go through the legs, thats what others meant with ripped leggings of fix the legs