This Japanese four-holes binding has just a few sheets.  1/4 of the cover is in fabric, and 3/4 hand-painted waxed paper.  The endpapers are hand-painted with paste.   The chosen colour is orange.  It is an oblong A5.  The covers are sewn to the single sheets

with waxed cotton thread. 
The covers have a hinge that makes easy to open the sketchbook.
This kind of binding is usually used for soft covers, for its easiness to sewing it.  But it gives a good result with hard covers as the ones that I used.