This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Nun's Cotton. A general designation applied to all fine white embroidery-cotton, from its use in embroidery on linen by Catholic nuns in convents. It is marked on the labels with a cross - the symbol of Catho-cism - and is sometimes called cross-cotton. [See Marking Cotton]