With SimpleLOD you can have an avatar model, apply several clothes meshes to it, add non-skinned meshes to the bones (like weapons or a helmet), combine it all into 1 skinned mesh, bake atlases and generate decimated meshes for LOD levels.
Of course the end result would still be better when you model everything by hand. But not everyone is a master 3D modeler and sometimes models are procedurally created at runtime. This package is for those people that want an easy solution for a complex problem.