Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Flameheart Vestment Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Flameheart Vestment suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Similar Items
The 9 items nearest to Flameheart Vestment (item level 50) in item level among Armor > Cloth, Chest slot, from item level 38 to 60.
Blizzard numbers items as they are created, so the named items next to ID 137504 (137499 to 137509) were usually added in the same batch as Flameheart Vestment: the same quest line, zone, vendor or reward set.