That sounds like a problem with the models - you are probably either missing a file, or have an extra one. Can you post a screenshot or a picture of it? If you do I can tell you which files you need to have or get rid of.
I want to make a mod. British uniform for Burma must have the shape of British battlebress with leather vest. But when I replace the models that Burma has a uniform texture of the brown battledress. I want to change only the shape of the uniform Burma.