How to have body rig and blend shape with dress mesh attached with it at run time

Hi,

I am working on a project which generates avatar with face (image provided) at runtime, in that we have avatar mesh as rigged one with blend shapes to have body shape based on measurement provided. I am attaching dresses to avatar based on selection, which is not rigged or have bone weight and blend shape. I would like to have same rig and blend shape that avatar body have to be with dress model at runtime. Is it possible? Could anyone help on this.

Thanks in advance,
Ben