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.
Collars And Cuffs. Articles of attire for both men and women, made usually of linen, and starched. The quality is denoted by the "ply," which ranges from 2-ply to 5-ply. Ladies' cuffs range in size from 7 to 9; boys'cuffs from 8 to 9; men's from 9 to 12. Men's collars range in size from 14 to 20; boys' from 12 to 14 1/2; ladies' from 12 to 16. One "size" of both cuffs and collars is one half inch in their length.