Mens costume ideas range from scary zombies to funny clowns and a variety of inflatable costume choices. What are some Halloween costume ideas for men? Mens costumes can be worn all year, not just on Halloween. Cosplay events, masquerade parties, pranks, plays, and even opening night for favorite superhero movies can spark a new interest in wearing a disguise and being someone else for a short while. Many Halloween costumes for an adult have the advantage of being appropriate for all ages.