Some of these websites actually sell costumes for Women’s Cosplay as well as those Adult Costumes. There are a ton of good costumes out there. Sadly, and despite the mounting popularity of cosplaying, finding a cosplay “store” is an impossible task. There’s one common narrative that some cosplay books point to: the first-ever World Science Fiction convention in 1939 in New York City, when a pair of fans, power ranger adult costume Forrest J. Ackerman and Myrtle R. Douglas showed up in costume.