Restricting to one outfit, or having an equipment system.
Like when the player spawns, he is put into the default western outfit.
They can find items and equip them (Or just have them automatically put on)
When they join a faction, their outfit will be changed to the uniform of that faction.
It would need to restrict changing the avatar, so the player couldn't change into some random character.
Also, frostbyte, we added a brick train that will use events.