E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
In Somersetshire bunting means sifting flour. Sieves were at one time made of a strong gauzy woollen cloth, which being tough and capable of resisting wear, was found suitable for flags, and now has changed its reference from sieves to flags. A bunt-mill is a machine for sifting corn.
Not unlike a bakers bunt, when he separates the flour from the bran.Stedman.