This is is a Japanese-language book or magazine devoted to fashion or cosplay ("COStume PLAY"), and may contain actual sewing patterns for creating your own clothing/costumes, as well as photos of completed outfits.
Mostly full-color photos of cosplayers doing what they do best; includes tips on improving your own costumes. There's a photo-feature on cosplayers at Anime Expo 2008 in Los Angeles, too! This issue includes a 32-page booklet on costume-making that explains basic terms, techniques, and materials. All text is in Japanese.