Read from the World of Warcraft client build files.
How Moonpriest's Sash Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Moonpriest's Sash suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Moonpriest's Sash is part of the transmog set Moonpriest's Vestments (Priest, Mage and Warlock only), which the Appearances collection lists in 2 versions. The other 11 pieces:
Blizzard numbers items as they are created, so the named items next to ID 165438 (165433 to 165443) were usually added in the same batch as Moonpriest's Sash: the same quest line, zone, vendor or reward set.