The fabric (book) dreams are made of
It seems likely that a book made of paper and board also has a paper cover. But there are many books with a cover made of cloth. These convey a completely different "look and feel". They allow fine embossing and decorations. The same applies to leather covers. As with cloth (with coated and uncoated surfaces) there are also various leather products (natural leather and leather cloth). All these are available in many different colours, embossings and surfaces.
Cloth is available in rolls, natural leather is supplied by the skin.