Frostwolf Battle Tabard

Source
This item is a PvP reward, and can be purchased for from:
 * in Alterac Valley
 * in Hillsbrad Foothills
 * in Orgrimmar
 * in Silvermoon City
 * in Undercity
 * in Thunder Bluff

This item was worn by Stan in the South Park episode "Make Love, Not Warcraft." This should not have happened seeing as this is only available to Horde whilst Stan plays a human.