Equipment Farming is a technique used to gain equipment from enemies that carry them.
This method is done by fighting the particular enemy carrying your desired item over, and over and over, until they drop it. They will be more likely to drop it if your character has a higher Luck stat, which can be increased by equipping certain accessories.
The Dangerous Fortune (US: Dangerously Lucky), Moogle Charm (US: Mog's Amulet), Fake Mustache and Rabbit's Foot accesories combined with the Super Ribbon (To stop the Charm/Amulet breaking) and the aforementioned Thief's Gloves make for an effective build for equipment farming. Equipping Incense of Miraclein (US: Mystery Incense) and Aromatic Tree of Miraclein (US: Mystery Resin) plus any LUK+4 Trade items like Rosetta Stones or the Lores to further boost the character's Luck is also a viable option