I really like the clothing that are already in the game, but i think that there is not enough to individualize all the survivors. For exemple there is juste one Scavenger's hat and their is as well only one for the Medic. So here's my suggestion of clothing:
-Red beret, "Iconic red military head cover. Fight with the british style" (fighter/leader ; move speed +1%).
-Blue beret, "Iconic blue military head cover. You are now a peacekeeper" (fighter/leader ; move speed +1%).
-Miner helmet, "Used by miners to protect their heads and enlighten the path" (scavenger/leader ; scavenge speed +1%).
-Homemade knight's helmet, "It is time to take the oath. For the living !" (engineer/leader ; health +1%).
-Red Cross military helmet, "symbole used by a well known humanitarian organization" (medic/leader ; heal speed +1%). The helmet is khaki with on is forehead a red cross.
-White Cross military helmet, "like that it match with the color of your uniform" (medic/leader ; heal speed +1%). The helmet is khaki with on is forehead a white cross.
-Cowboy's hat. the same that the sheriff's hat, without the star and perhaps in a several choice of color (recon/leader ; ranged combat +2%).
-Executioner hood (brown or black), "Heads are going to fall !" (Melee combat +2%).
-Plague doctor mask, "old school medicine... try to survive this !"(medic/leader ; heal speed +1%).
-Keffiyeh, "used by military to protect their mouths and noses from the dust of the desert" (scavenger/leader ; scavenge speed +1). The Keffiyeh is around the neck.
(I have searched for a post talking about the same subject but I didn't find anything, so if I have repeated the idea of another person I'm sorry about that.)