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.
Sack. [A word found with little variation in all languages, generally regarded as being derived from ancient Hebrew sag, a bag for holding corn] A coarse-woven bag for holding grain, etc.; it is known among nearly all eastern nations as a sack. The wide diffusion of the word is probably due to the incident in the story of Joseph, in which the cup was hidden in a sack of corn (Genesis, xiii). Also a kind of jacket or short coat, cut round at the bottom, fitting the body more or less closely, and worn at the present day by both men and women; as a sealskin sack, a.sack coat. Among our rude ancestors it was a kind of a cloak of a square form, worn over the shoulders and body, and fastened in front by a clasp or thorn. It was originally made of skin, afterwards of wool, but of whatever material always called a sack. When first introduced in France in 1665, for ladies' use, the garment was cut with a loose, sack-like back, not shaped into the waist, but hanging straight from the neckband. Sometimes spelled sacque.