We have so many classes now, its silly that we only get one piece of gear per class now. In older games they solved this issue by putting sets in patterns. This made it so everyone had an equal or close to equal chance to get their gear.

Pattern of the Strategist's (set) piece.
Bard, Scholar, Ninja, Astrologian
Right click to select your class and piece of gear.
25% drop rate.

Pattern of the Reaver (set) piece.
Black Mage, Dark Knight, Dragoon
Right click to select your class and piece of gear.
25% drop rate.

Pattern of the Holy (set) piece.
Paladin, Monk, White Mage
Right click to select your class and piece of gear.
25% drop rate.

Pattern of the Warmonger (set) piece.
Warrior, Summoner, Machinist
Right click to select your class and piece of gear.
25% drop rate.