In either a mod, or in vanilla game folders, the FBX to tc3d file conversion appears to break some mapping to the hair_all_all_glasses_fixed.png. (the resulting staff, e.g. will have the polygons for the glasses textured with whichever hair color is in its definition).

This was originally an issue in creating mods, but seems to be in the normal FBX-t3cd conversion routine.
(in C4D the hair_xxx_xxx_xxx meshes that have glasses have 2 materials and 2 selection tags, but somehow the converted t3cd doesn't pick that up).

Test steps, with no mods active

1) In GameData/Models/t3cd hide 2_staff.t3cd by renaming to HIDE2_staff.t3cdHIDE
2) Copy original fbx 2_staff.fbx into GameData/Models
3) Start game - check screen and log that 2_staff.fbx was converted to 2_staff.tc3d and file loaded
4) Resume a game with staff (that previously showed correctly) - those with glasses now have incorrect textures.

Have tried various attempts at having the .png files in a mod, copying the original 2_staff.fbx into a mod, etc. and always get the wrong glasses texture.