Ebonweave is created with Tailoring (415); taught by Tailoring trainers in Northrend. The recipe turns yellow at 425 skill, green at 430, and gray at 435.
Patch 10.0.2 (2022-11-15): Stacks to 1000, up from 200.
Patch 6.0.2 (2014-10-14): Stacks to 200, up from 20.
Patch 3.3.3 (2010-03-23): Creating Ebonweave no longer has a cooldown or location requirement, but also no longer provides the [Residue of Darkness] buff on creation.