Incognito Mustache

Incognito Moustache is a collectible item unique to the 2012 Halloween event The Witching Hour.

Source
The Plastic Fangs is an item that can be looted as a drop from Klarion in the The Midnight Masquerade alert. from any collection node in Gotham.

Collection
Incognito Moustache belongs to the All Hallow's Peeves item collection.