A friend of mine and I , we had a go at a varient armour system.
Basicly all armour had 3 armour values, one for piercing, one for bludgeoning and one for slashing. For example:
padded armour 1/1/1
studed leather 2/1/2/
chain mail 3/4/5
plate mail 6/7/9
And so forth. I dont know...