E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Mob-cap (A).
Is a plain cap, from Dutch mob = a cap Probably mop is another form of the same word, and all come from the Latin mappa (a clout), whence our word map (a drawing on cloth), in contradistinction to a cartoon (a drawing on paper).
