You're dead wrong if you think the West can't cosplay. It so can. And at the recent Anime Expo in Los Angeles, America did just that: cosplay.
There are some very inventive outfits here. Love the Ice Climber cosplay, love it. More pics at Kotaku Japan and in the link below.
本格派から謎の物体まで！ 会場で見かけたコスプレイヤーさんたち [週アスPLUS]