Crepe (Crape) dates back to the 17th century. We have found primary examples of silk crepe often used for mourning in the 18th century. In the 19th century many new types of crepe were invented. One such invention for wool "crape" was patented by Stephen Wilson in 1822. It employed two wefts of worsted over a ground of worsted or other fiber. The yarn was spun five to seven times harder than normal yarn and laid in opposing manner. This created the wrinkly or pebbly finish we still recognize today as crepe. We consider this fabric to be suitable for post 1820's fashion.