Fonline world is desert, there is preaty much of sand, so wearing sand colored robes may cause you be less noticeable. I propose: for sand colored robes +20%/+30% bonus to outdoorsman when equiped. Helpful for character on low level to go around the map. After 100% of outdoorsman is almost useless.
This perk should be assigned to deasert hunters armor, but there is no point of that. If you manage to get one of this armors you are probalby not afraid of any encounters. But if perk will be implemented, why not assign it to this armor to.
Another possibility:
Bonus for sneak skill only in special encouters (on sand)