Definition of "cummerband"

Richard Middlemas, as the Begum's general or Buckshee, walked nearest to her litter, in a dress as magnificent in itself as it was remote from all European costume, being that of a Banka, or Indian courtier. […] The vest was of gold brocade, with a cummerband, or sash, around his waist, corresponding to his turban.

1827, [Walter Scott], chapter XV, in Chronicles of the Canongate; […], volume II (The Surgeon’s Daughter), Edinburgh: […] [Ballantyne and Co.] for Cadell and Co.; London: Simpkin and Marshall, page 353