Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Shivbreaker Vest Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Shivbreaker Vest suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Shivbreaker Vest is part of the transmog set Mogu Lord's Regalia (Hunter, Shaman and Evoker only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Shivbreaker Vest Fits
Other Items Named Shivbreaker Vest
2 other items in the current build are also called Shivbreaker 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 143968 (143963 to 143973) were usually added in the same batch as Shivbreaker Vest: the same quest line, zone, vendor or reward set.