Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Burrower's Cinch Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Burrower's Cinch suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Burrower's Cinch is part of the transmog set Threads of Awakening (Priest, Mage and Warlock only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 221158 (221153 to 221163) were usually added in the same batch as Burrower's Cinch: the same quest line, zone, vendor or reward set.