Wool
From Tardis Wiki, the free Doctor Who reference
Wool was a form of natural fibre sourced from an animal such as a sheep or from a plant in the case of cotton wool. (TV: The Doctor, the Widow and the Wardrobe, The Web Planet)
Phraseology
To "pull the wool over someone's eyes" suggested deception of someone. (TV: The Armageddon Factor)
See also
Wool was used in the construction of clothing.