Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Terrorweave Gloves Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Terrorweave Gloves suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Terrorweave Gloves is part of the transmog set Vestments of the Manasinged (Priest, Mage and Warlock only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 121325 (121320 to 121330) were usually added in the same batch as Terrorweave Gloves: the same quest line, zone, vendor or reward set.