ClearlyTough69
Explorer
I'd house rule it. If you're not wearing a helmet, you don't get the full effect of the armor. So if they aren't wearing a helmet, reduce the AC from that armor by 1.
You could go further and impose disadvantage on Perception checks that rely on hearing.
[EDIT] I've just discovered that several people have said this already - my apologies for not reading the full thread and for any trodden-on toes.
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