Explain cosplay plainly. Costume play involves dressing up and pretending to be a particular character from an movie. It has become a massive trend amongst fans of geek subculture around the world. People diligently craft costumes and props to accurately portray their favorite characters. Cosplayers frequently attend events or costume play events, where they can display their artistry and connect with like-minded individuals who share the same passion. Ultimately, costume play is an form of appreciation and commitment for the fictional character and a love for the nerd community.