book muslin

Century Dictionary and Cyclopedia

1. n. A fine kind of transparent muslin having a stiff or elastic finish: so called from being folded in book form.

Wiktionary

1. n. A kind of muslin used for the covers of books.
2. n. A kind of thin white muslin for ladies' dresses.

GNU Webster's 1913

1. A kind of muslin used for the covers of books.
2. A kind of thin white muslin for ladies' dresses.