When I export CC3 character for Unity (FBX Format), the character structure is based on clothing layers such as undershirt, shirt, coat, pants, etc.

This character structure is painful when I'm working on a First Person Shooter game (FPS). In FPS games, I need to be able to toggle on/off the visibility of the character's head and arms. For example, if I toggle the arms off, the arms, long sleeves of the shirt/t-shirt, jacket sleeves, etc. should all disappear.

Therefore, I wonder if there's any way to export the CC3 character based on body parts such as head, body, arms, legs, etc.

I know I can do that by exporting it to Blender (not a big fan) or do it using plugins in Unity. But that's not an optimum solution and usually results in flawed character or errors in Unity.

I'd like to keep my character optimized (in terms of polygons) and export it correctly to Unity based on body parts.

I have 3DXchange as well but I'm not sure if that helps?

Any solutions, ideas, or recommendations?

Since there is a delete hidden mesh box that you can check in the FBX export panel, you can use the mesh editing tools to hide any mesh, or part of mesh. Then the hidden part is deleted on export.

I tried this approach multiple times. 
In Unity, I need the character in the following sets:
1- Full body character, including the head. I should be able to hide the head and arms on this character using invisible overlay material.
2- Arms of this character.

Oh, I am facing the same problem, did you found a solution? Or may be anybody can help, please