Quote Originally Posted by Kurohime
Zidane's Thievery:

THIEVERY DAMAGE = (1/2 speed stat) x Number of successful steals.


So you can increase his Thievery damage by eqipping him with things like Thief's Hat and Thief's Gloves. Once you steal enough get him up to quad-9 damage, you can equip him with whatever.

All hail Kurohime, queen of all things FF9.