You’ve stuffed up Stuffed Armor. The way it works currently, you can actually be quieter by wearing an extra 17 pounds of chainmail. And then, if you add on a helmet, you can actually make 0 noise, zero, nought, nada, none at all, while fully equipped in the heaviest armor.
The 20% quieter bonus, instead of just applying to the piece of armour you equip, applies to all of your armor and clothing. Worse still, the bonus stacks, which leads to you becoming a ghost who makes no noise.
This is a really obvious bug, which doesn’t even make sense as a gameplay feature if you cared nothing for reality. It simply makes noise disappear from gameplay considerations. Please fix it.