Champion's Dreadweave Cowl

The Champion's Dreadweave Cowl is the cloth helmet of the Horde PvP-Rare Warlock set called the Champion's Dreadgear.

Source
This item can be purchased from First Sergeant Hola'mahi located in the Hall of Legends in Orgrimmar. It costs 4335 Honor Points and 30 Alterac Valley Marks of Honor.