Read from the World of Warcraft client build files.
How Dragonflayer Vest Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Dragonflayer Vest suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Dragonflayer Vest is part of the transmog set Wyrmstalker Battlegear (Hunter only). The other 14 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Dragonflayer Vest Fits
Other Items Named Dragonflayer Vest
2 other items in the current build are also called Dragonflayer Vest. 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 78579 (78572 to 78584) were usually added in the same batch as Dragonflayer Vest: the same quest line, zone, vendor or reward set.