The Arcanoweave Robe can only be crafted by tailors.
To do so, they need to learn the Pattern: Arcanoweave Robe which is dropped by Pathaleon the Calculator in the Mechanar.
I got mine at the 6th or 7th try.
- Source: Tailor
- Level: 70
- Binds: BoE
- Armor: Cloth
- Slot: Chest