Source : Webster's Revised Unabridged Dictionary (1913)

Jaconet \Jac"o*net\, n. [F. jaconas.]
   A thin cotton fabric, between and muslin, used for dresses,
   neckcloths, etc. [Written also {jacconet}.]

Source : WordNet®

jaconet
     n : a lightweight cotton cloth with a smooth and slightly stiff
         finish; used for clothing and bandages