Step One: VRoid Studio
ik fix still needed?
moving 3d cursor to line up faces, not the bones
using cats, merge armatures, attach mesh
edit shader settings
Blender, import VRM, edit blendshapes, attach mesh, merge armitures...
To stack exact meshes:
okay so i still haven’t found 100% way because depending on shoes, the mesh doesn’t line up exactly, or the face volume is different... the process is mostly the same, just instead of always ‘cursor to selected’, try the other snap options that might fit better