• Swordguard Embroidery
• 4 second cast
• Requires Cloth, Leather, Mail, Plate
• Reagents:
  [Spellweave], [Eternium Thread]
• Embroiders a magical pattern into your cloak, causing your damaging melee and ranged attacks to sometimes increase your attack power by 400 for 15 sec.
  
  You can only embroider your own cloak and embroidering your cloak will cause it to become soulbound. Requires 400 Tailoring to use.
• Requires Tailoring 400

Permanently enchant a tailor's own cloak to give a chance to increase attack power when doing melee or ranged damage.

Source

Taught by a tailoring trainer for 12 50, requires 420 tailoring skill to train.

Materials required:

1x [Spellweave]

1x [Eternium Thread]

Patches changes

Patch 3.2.0 (04-Aug-2009): Changed to chance to increase attack power by 400 from prior value 300. 
/ Patch 3.0.2 (14-Oct-2008): Added. 

External links

• Wowhead
• Thottbot
• WoWDB