translating an accessory from source mesh to a targeted mesh

I have around 4 base models and have around loads of accessories created. All the accessories are created for one of the base mesh.

The 4 base models represents different body types( slim , heavy, muscular and skinny). I would want the accessories created for one of the base model to fit for all the base models.

need to create an automated tool which deforms the accessories from the base model to the target mesh, so the work load of the artist becomes less or the project will become never ending. How do I go about doing it?.

Any ideas are welcome. Please tell me if u are not able to understand the question.