Invisible skin worked in preview, not in game?

Hi. Changing shader to Simglass is the only way of making a CAS mesh invisible via texture. The thing is, skin or skin details do not have meshes ( I assume they can be extracted somehow from the warehouse tab but its not the best idea either way). What you can do is clone the outfit you want to put on your sim, export the blend, delete its visible body parts(do not touch body parts that are under rig),save, import back, exclude the head, feet, etc