Doh, ok seafarer requires seafarer temper which needs sea salt(nodrop fished item in OOt) and sea foam (dropped by mobs in Oot) and this armor is enchantable also. the temper is made with 140 brewing skill
It's saltwater seaweed that is fished there in OOT no drop and does not stack. The mugs of sea foam are dropped off of sea fury cyclops and the mail is 18 ac and wearable by vah shir also