your birthday suit works best. there's a new pre head piece with a +1 att to get if it's not too late.
In the old days, when 600 was called Spirit Bonding, i used a pair of footies and a dragon mask, but everyone demanded i put my pants back on. :P
while 15 armor can do the job of 600 just fine, die-hard farmers like me and my guildies prefer the 5 armor pre set. But you can count the instances it matters on 1 hand.