This item is acquired in-game. See its sources below.
In the Appearances collection, Time Walkers is listed as Quest. Appearance ID: 69536. 6 other items wear the same appearance:
Read from the World of Warcraft client build files.
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Time Walkers suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Time Walkers is part of the transmog set Trailblazer's Cloth Armor (Priest, Mage and Warlock only). The other 16 pieces:
Expedition Researcher's Pantaloons
Expedition Researcher's Gloves
Expedition Researcher's HoodExpedition Researcher's Leggings
Expedition Researcher's Mantle
Expedition Researcher's Sash
Expedition Researcher's WrapsExpedition Researcher's Treads
Expedition Researcher's VestmentsBeetender's HoodLife Vault CordExpedition Researcher's Binders
Annihilation Warder's CloakArtist's CinchSister's TokenChronomental HalfglovesBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Time Walkers is not traded on the Auction House, so it has no Auction House price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB