This item is acquired in-game. See its sources below.
A Rare Leather Chest, item level 41, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Overgrowth Cutter Vest is listed as Quest. Appearance ID: 22067. 3 other items wear the same appearance:
Read from the World of Warcraft client build files.
4 quests list Overgrowth Cutter Vest among their rewards in Blizzard's quest data.
Foundry-Fired Plate Chestplate, 
Wildwood Wrangler Vest, 
Steamburst RobeFoundry-Fired Plate Chestplate, Wildwood Wrangler Vest, Steamburst RobeFoundry-Fired Plate Chestplate, Wildwood Wrangler Vest, Steamburst RobeFoundry-Fired Plate Chestplate, Wildwood Wrangler Vest, Steamburst RobeRead from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Overgrowth Cutter Vest suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Overgrowth Cutter Vest uses icon file 1006304, which 18 other items also use. The 5 closest by item ID:
Talador Sentinel Vest ID 112511 · Armor - Leather · item level 42Slavebreaker Tunic ID 112441 · Armor - Leather · item level 39Goreseeker's Goresplattered Garb ID 112094 · Armor - Leather · item level 40Podling-Husk Tunic ID 113153 · Armor - Leather · item level 40 "Prickly where it brushes against bare skin, despite being well treated."Bloodthorn Chestguard ID 114251 · Armor - Leather · item level 40Blizzard numbers items as they are created, so the named items next to ID 112590 (112585 to 112595) were usually added in the same batch as Overgrowth Cutter Vest: the same quest line, zone, vendor or reward set.
Ra'tok's Throatguard ID 112585 · Armor · item level 42
Riverbeast Femur ID 112586 · Weapon - One-Handed Mace · item level 42
Riverbeast Tusk Shank ID 112587 · Weapon - Dagger · item level 42Foundry-Fired Plate Chestplate ID 112588 · Armor - Plate · item level 41Wildwood Wrangler Vest ID 112589 · Armor - Mail · item level 41
Foundry-Fired Plate Warboots ID 112591 · Armor - Plate · item level 41
Steamburst Treads ID 112592 · Armor - Cloth · item level 41
Wildwood Wrangler Sabatons ID 112593 · Armor - Mail · item level 41
Overgrowth Cutter Boots ID 112594 · Armor - Leather · item level 41
Overgrowth Cutter Gloves ID 112595 · Armor - Leather · item level 41The raw ItemSparse values for item 112590 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB