Source : Webster's Revised Unabridged Dictionary (1913)

Cummerbund \Cum"mer*bund`\, n. [Written also {kummerbund},
   {cummerband}, etc.] [Hind. kamarband, fr. Per. Kamar loins +
   band fastening.]
   A sash for the waist; a girdle. [India]

Source : WordNet®

cummerbund
     n : a broad pleated sash worn as formal dress with a tuxedo