In five minutes this video covers the history of wool production, the qualities of wool fabric, and everything that goes into producing wool fabric. See a sheep being sheared, and watch as the wool travels through a factory where it is cleaned, blended with other fibers, carded, and spun into yarn. The yarn is then woven into fabric and finished. 

https://www.youtube.com/watch?v=FsRxMsBGuFs

Science/Discovery Channel