Source : Webster's Revised Unabridged Dictionary (1913)

Brandenburg \Bran"den*burg\, n. [So named after Brandenburg, a
   province and a town of Prussia.]
   A kind of decoration for the breast of a coat, sometimes only
   a frog with a loop, but in some military uniforms enlarged
   into a broad horizontal stripe.

         He wore a coat . . . trimmed with Brandenburgs.
                                                  --Smollett.

Source : WordNet®

Brandenburg
     n : the territory of an Elector (of the Holy Roman Empire) that
         expanded to become the kingdom of Prussia in 1701