Dressing up as a character from anime, manga, video games, etc. Abbreviation of コスチュームプレー.
週末のイベントでコスプレを楽しんだ。
I enjoyed cosplay at the weekend event.
She cosplayed as her favorite anime character.
She is cosplaying an anime character.
みんなコスプレ姿で写真を撮った。
Everyone took photos in their cosplay costumes.
I'm planning to attend a cosplay event with friends next month.
コスプレ names the hobby or act of dressing up as a character, while コスチューム is the physical outfit itself that one wears to do コスプレ.
cosplayer
cosplay show
cosplay dance party
cosplay dance party
Abbreviation of コスチュームプレー, from English 'costume play'.