From wikipedia: Cosplay (コスプレ kosupure), short for “costume roleplay”,is a type of performance art whose participants outfit themselves, with often-elaborate costumes and accesories, as a specific Character or idea. Characters are usually sourced in various Japanese and East Asian media, including manga, anime, tokusatsu, comic books, graphic novels, Video games, and fantasy movies.
I remember first time I came to the cosplay event was on my undergraduate school. It was in a university somewhere around East jakarta. I went there to accompany my crazy cousin (but I love her). She was crazy with things come from Japan, maybe now she realize how weird she acted at that time :P. Cosplay in Indonesia was introduced around year 2000 from Gelar Jepang Universitas Indonesia (Japanese Event in University of Indonesia) until become very famous nowadays in some cities in Indonesia.
In Seoul, I went to this event twice, doing picture hunting meet-up with friends from FIS. Here cosplay event was crazier that I ever saw, teenagers wore their costume like almost perfectly. I wonder how much money they spend for that. They become totally different person I think. Having their own favorite character became very interesting picture object for me, it ia quite easy to take pictures of them because of some reasons. First they dress very well (read: costumed), they put on make up, and they like to pose..perfect for me..and then cosplay become one of my picture theme collections.