Deecey, MIKI and Koji were quite a secces because they were the first Poser meshes who actually looked like people of asian heritage.

People were sick and tired of the generic DAZ face morphs that looked like anything, but not a real asian.

If you morph a mesh too much, it'll break. The joints break, the morphs break. Even if you just morph the face.

For clothes a full body morph and a joint injection pose should do.
And if WW2 can go from the Freak to Matt, it should be able to get from "thin Vicky" to "fat Vicky", or from "Superman Mike"  to "Mild mannered alter ego Mike".

Winning NASCAR with a VW Bug only works in the movies.
In the real world you need a special car for a special job.