I've scanned google and found nothing related to exactly this problem; every time I use skin editor + EUP 7, parts of my clothes disappears. To be precise, my hat and my bulletproof vest will either disappear randomly or upon entering any vehicle. This is highly annoying since I have to use trainer to spawn those each time I run around. 

Anyone have any clues or ideas?

P.S. I do have uniform skins for high visibility vest and shirts (not used with my character)   

yes it happend to me everytime i grab my handgun it would make my vest vanish in thin air the fix i found on the eup support topic is to pick your guy and force duty through rage plugin console 

I've used the Spacebar and F9 to force duty, is there a console command for it? 

36 minutes ago, Baja002 said:

I've used the Spacebar and F9 to force duty, is there a console command for it? 

Review the documentation, but yes there is. It's "ForceDuty". 

1 hour ago, Baja002 said:

I've used the Spacebar and F9 to force duty, is there a console command for it? 

yes just type in force in the rage console after u pick your ped from eup