If you go into the files: APB Reloaded/APBGame/Content/Release/Packages/APB_CharacterTool/ **Male or Female**/
you will find a bunch of different files
each one with the full name, and an additional file with a similar name but has something like BRDF Mapping
do some simple name switching and i'm pretty sure it should work.
remember to change the name of both of the files.
so if i want F_Facewear_Mask_Clown and i own the F_Facewear_Mask_Criminal_Bandit
i copy the MASK CLOWN, and create a copy of it in the same folder. rename it F_Facewear_Mask_Criminal_Bandit
and do the same for the BRDF Mapping file
btw, this also works for underwear on the females
if you delete or make the underwear an invalid name, you'll be naked!
(no vag, just nips)