Flimsy Mask

Flimsy Masks are temporary head items which can be worn by any player at any level. Flimsy masks are sometimes received inside a Treat Bag by an innkeeper in various towns while trick or treating, or by the Loot-Filled Pumpkin from killing the Headless Horseman. They are available during the Hallow's End seasonal event, and have a duration of 7 days once received.

Masks
You may be looking for one of the following:
 * Blood Elf Female Mask
 * Blood Elf Male Mask
 * Draenei Female Mask
 * Draenei Male Mask
 * Dwarf Female Mask
 * Dwarf Male Mask
 * Gnome Female Mask
 * Gnome Male Mask
 * Human Female Mask
 * Human Male Mask
 * Night Elf Female Mask
 * Night Elf Male Mask
 * Orc Female Mask
 * Orc Male Mask
 * Tauren Female Mask
 * Tauren Male Mask
 * Troll Female Mask
 * Troll Male Mask
 * Undead Female Mask
 * Undead Male Mask

Related Achievements

 * - gain any one flimsy mask
 * - gain each of the available flimsy masks

Trivia
In July of 2009, Blizzard accidentally released into the game's database Goblin and Worgen masks which spurred a huge amount of speculation among the players about new races.