Kate Davies starts off with fleece just as it comes off the sheep (basically grubby, greasy, smelly lumps of matted hair) and photo-tours through the large-scale cleaning and processing that leads to the product known as "top" (fibres that have been combed but not carded): At Haworth Scouring
Then the Yarn Harlot picks up from there with roving (fibres that have been carded) and takes you the rest of the way (on a much smaller scale) to finished garment: Flipbook