Dragonhide = Feral
Kodohide = Restro
Wyrmhide = Balance
As for Feral PvP, there isn't really a best set. The PvP style of feral druids can vary alot, and so you'll find that different feral druids have different preferances for what gear they prefer.
For example, I am roughly equally reliant on bear and cat form in PvP, but I don't make alot of use of caster form. So for PvP alot of my gear is focused on stam, agi, str and armor. So for my play style, I'd do better to PvP in tier 4 then feral arena set.
However, I'm aware that my primary weakness is caster form and as I learn to better incorperate it into my style, I'll likely rethink my pvp gear to add more int and +healing.