Some ideas:
ItemSet 302386
Bare minimum you want Arhat's Gi and Jinpachi. Can also get Wiglen Gorget for the neck if you want to spend some money or don't have Twilight. Will probably have to farm some ra/ex in some fashion to round out a decent set, but Arhat's is a good start. If you can afford HQ Arhat's it's well worth it as the boost is significant (-15% vs -10%).