The Spare Wig is treasure that can be obtained in Sly Cooper: Age of Thieves that can be found in the episode Alice in Cooperland. It is worth 199 coins, and the allotted time to get the loot to the safehouse is forty-five seconds.
"Ven St. Claire is known for keeping spare wigs in case his current one gets stolen or lost. This blonde one is seemingly modeled for those who love disco. Needless to say, this is perfect for those who like to party."
It is located underneath the Hatter Tea Cup Ride. Only Bentley can obtain this treasure.