Cosplay Basics by by Yuki Takasou, Rumine, and Kashiko Kurobuchi
This is an English translation of a Japanese book that provides an introduction to cosplay with chapters on tips, shopping, and costume construction, interspersed with short manga chapters showing a seasoned cosplayer showing a newbie the ropes. A magical girl character is used as the focus for the whole book, so this will be most useful for folks who are interested in feminine cosplay.
I don’t think anyone would really be able to construct a costume from start to finish with only the information given in this book, as there’s not enough detailed information given about measuring yourself, making patterns, adjusting fit, etc. There are several sections with step-by-step instructions, but I think someone making pattern pieces based on the information in the book would need to do a bit of experimenting on their own to come up with something usable. But like the title suggests, it does provide a basic overview of the topic, and a reader would be able to take the terminology in the book and then look up a more detailed youtube tutorial about placing darts, for example. There are sections dedicated to cosplay specific topics like wig styling, photographing etiquette, posing like your character, and now to retouch your own photos of your cosplay before you post them online.
Cosplay Basics would be a good addition to library collections for libraries that have active anime clubs or other similar programming like ToshoCons. If I had a young teen newbie cosplayer to hand a book to, I would probably combine this volume with another book that had more of a general focus on sewing and construction principles. The short chapters combined with manga make it easy to dip in and out of the book while exploring different aspects of cosplay.