A werewolf is a mythical creature that turns from a human into a wolf like animal during a full moon then returns back to human form by morning. Some versions of werewolf can transform back and forth at will. A werewolf costume can be either a partial costume or a full body costume. For a partial costume a werewolf mask and claws can be worn with normal clothing in a style made popular by the 1985 movie teen wolf. For a full werewolf costume a fur like suit can be worn with a mask and claws to create a very scary looking costume for Halloween. Werewolf costumes have been made increasingly popular due to the Underworld series of movies where the creatures go by their Latin name of Lycanthrope or Lycan for short.