Mesh Baby clothes meshing?

Is there a tutorial anywhere for age conversion to BU from PU? I can get it to almost sorta work. It shows up in Bodyshop, but not in the game. I'm very confused.

Bodyshop:


I switched the texture property to be PU/BU (21), edited the mesh to fit the BU size and shape, made the textures smaller. I'm kind of at a loss, and I haven't been able to find any tutorials.