This item is acquired in-game. See its sources below.
A Rare Cosmetic Back, item level 1, binds when picked up.
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
In the Appearances collection, Thread-Bearer's Cloak is listed as Vendor. Appearance ID: 90549. No other item uses this appearance, so it is unique to Thread-Bearer's Cloak.
Read from the World of Warcraft client build files.
Thread-Bearer's Cloak is part of the transmog set Thread-Bearer's Carapace. The other 2 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Blizzard numbers items as they are created, so the named items next to ID 218348 (218343 to 218353) were usually added in the same batch as Thread-Bearer's Cloak: the same quest line, zone, vendor or reward set.
Tabard of the Assembly ID 218343 · Armor - Cosmetic
Honorary Councilmember's Spaulders ID 218344 · Armor - Cosmetic
Honorary Councilmember's Cloak ID 218345 · Armor - Cosmetic
Honorary Councilmember's Tabard ID 218346 · Armor - Cosmetic
Thread-Bearer's Pauldrons ID 218347 · Armor - Cosmetic
Tabard of the Severed Threads ID 218349 · Armor - Cosmetic
Expeditionary Spaulders ID 218350 · Armor - Cosmetic
Expeditionary Cape ID 218351 · Armor - Cosmetic
Expeditionary Tabard ID 218352 · Armor - Cosmetic
Caustic Solvent ID 218353 · Quest "A bucket filled with one perfect sponge and a caustic liquid with which to cleanse mossy covered earthen."The raw ItemSparse values for item 218348 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
TheWoWDB