The Collaborative International Dictionary of English v.0.48:

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]
   [Webster 1913 Suppl.]