Wonder what <if any> complimentary pieces will go with this set, seeing as how Omen had items that enhanced accuracy. My guess is it will be Job Specific belts and other accessory slot style items that enhance DAMAGE types <given that each piece currently has ATTACK / MAB or both on it.
My two cents on thief pieces 3/5 made so far on my character.
THF body is BiS for Trick Attack and great when paired with AF+3 hands and a Vajra.
THF Feet Are BiS for TP build
THF Hand's when combined with Taming Sari mean you can store your EMP boots because all you Treasure Hunter is Taken care of.
THF headpiece beats out anything in its slot for TP+STATS+ACC+ATT, at least until the Empy gets its upgrade.
THF legs are good weaponskill piece, maybe not best, but good.