E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Skins having bristly hair like that of goats. (Hircipilusi.e. goats hair. (Festus.) A fell is Anglo-Saxon for skin, like the Latin pell-is, English peel. Thus we say still a wool-fell. Shakespeare speaks of a fell of hair (Macbeth, v. 5). Fellmonger, a dealer in skins.