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.
Volume 6 of Dengeki Layers ("layers" is Japanese slang for "cosplayers") is full of color photographs of intricately dressed cosplayers showing off what they do best! Includes tips on making your costume the best it can be! All text is in Japanese.