Do you remember rushing down to the local J.C. All that changed when the first mass-produced Halloween costumes appeared in the 1930s as trick-or-treating increased in popularity.īen Cooper, Inc was in the forefront of the Halloween-costume industry. Halloween costumes were traditionally modeled after supernatural figures such as ghosts, witches, and devils. Irish immigration brought Halloween to America in the 19th century and it was assimilated into society by the 20th century. People would leave “treats” at front doors and would dress in costumes to appease the roaming spirits. Celts believed the ghosts of the dead roamed the Earth on this holiday. Halloween’s origins come from the Celtic festival for the dead called Samhain.