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.
Oiled Silk. Thin silk saturated with boiled oil, semi-transparent and waterproof. It is much used in tailoring and dressmaking to prevent perspiration from passing through, as at the armpits of garments and the lining of men's hats and ladies' bonnets.