I'm sure this idea would have been brought up before at some point, but I was thinking the other day after speaking to an Immigrant caked in a weeks worth of filth that it would be great if there were negatives to charisma in relation to your state of cleanliness.
For example, the ugly would become incredibly repulsive if they were caked from head to toe in filth. Bloodstains would probably have a negative effect as well as grievous wounds.