There are many patterns for these online if you google. Tom Baker wore several different scarves. There are different color combinations for each one. Most of the patterns I've seen for these are 12-14 feet long. The producers of the show bought a bunch of wool, gave it to a woman knitter, and asked her to make a scarf. She thought they meant for her to use it all up. The original scarf ended up being 20 feet long.