The art really makes this one worth while. So when you exit this thing, do you slide from the groin area of the suit covered in fluid? I will assume that is the case, and give this the 5 that imagery diserves.
The size and number of knots in hair, tied around neck, or hanging from belt could signify family, importance, worship, guild affiliations. Being able to translate the meaning of the size and placement of knots can give you a a large understanding of who somebody is.
May be used in a more barbaric society. Where in cities peoples clothes and crests show who they are, barbarians have no need for this so use knots.