Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Heroes' Earthshatter War-Kilt Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Heroes' Earthshatter War-Kilt suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Heroes' Earthshatter War-Kilt is part of the transmog set Heroes' Earthshatter Regalia (Shaman only). The other 16 pieces:
Items Numbered Next to Heroes' Earthshatter War-Kilt
Blizzard numbers items as they are created, so the named items next to ID 39603 (39597 to 39608) were usually added in the same batch as Heroes' Earthshatter War-Kilt: the same quest line, zone, vendor or reward set.