Girdle Book, Chemise Cover - Josh the Oxborrow

Make a book of pretty much any type. I used a coptic stitch because it was a common structure to be used in the later medieval periods. Most books in this period had wooden covers in order to handle the stress and wear.
Once you have a book you will need to cut out a piece of leather

The top will double the cover and 4/3 of the cover and then the text block. The lower width will be a bit more than the vertical of the cover. Leave a long tail the width of double the cover and a good length. Sew along the dashed lines and put a knot on the end of the tail. When you put the book into the cover the tail of the book goes towards the tail.