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.
Polo-Cap. A variety finished without peak or roll, usually made of silk, low, flat-crowned and soft. Men's traveling caps are made polo style.