There are upsides and downsides to EVERY bit of armor.
In chainmail/sharkmail, it wouldn't be fully protective, but a zombie/shark/zombie shark would certainly have a tough time with it. It would, however, allow for more movement than...
Platemail, which would be much more protective, but so limiting in movement. And tiring. If you could even find it...
Kevlar vests would be good against claws and offer some protection, but would definitely be better against survivors.
However, what's to say no one has invented special anti-zombie armor in the weeks/months since infection? Probably logic, but hey.
And, back on topic, I think legendary items would be a cool feature, if they were hidden in odd locales or hard-to-reach places.
If they could be realistically found, I'm game for legendary objects. Nothing outragous, maybe just a gun that's got better stats than something you would usually find, or custom 'survival armor' that an old survivor made for himself.