This tabard can be purchased from Dame Evniki Kapsalis for 50 of Champion's Seal. Note that you need to have the achievement Exalted Argent Champion of the Alliance / Horde to access the vendor.
In Warlords of Draenor, this item will be added to the new Toy Box feature and no longer take up a bag slot. You will be able to "use" the item straight from the Toy Box interface.
The Toy Box will be account-wide and therefore so will this item.
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