Read from the World of Warcraft client build files.
How Guardian Serpent Robes Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Guardian Serpent Robes suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Guardian Serpent Robes is part of the transmog set Guardian Serpent Regalia (Priest only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Guardian Serpent Robes Fits
Other Items Named Guardian Serpent Robes
2 other items in the current build are also called Guardian Serpent Robes. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 86700 (86695 to 86705) were usually added in the same batch as Guardian Serpent Robes: the same quest line, zone, vendor or reward set.