Is There a Psychology of Cosplay itstartswithadamDefine costume play heart in layman's terms. Costume play involves dressing up and pretending to be a particular character from a TV show. It has a huge sensation among fans of nerd subculture internationally. People thoroughly craft costumes and props in order to faithfully represent their favorite characters. Costume players commonly participate in conventions or costume play events, where they can exhibit their creativity and network with like-minded individuals who share the same passion. Ultimately, costume play is an manifestation of appreciation and commitment for the fictional character and the love for the geek community.