Define costume play heart in layman's terms. Costume play refers to dressing up and pretending to be a particular character from an anime. This trend has become immensely popular amongst enthusiasts of geek culture around the world. Fans thoroughly design costumes and accessories that accurately reflect their favorite characters. Costume players commonly attend events or cosplay events, where they can exhibit their artistry and connect with others who share the same passion. In the end, costume play is an form of admiration and commitment for a fictional character and a love for the geek community.