nainsook

from WordNet (r) 3.0 (2006)

nainsook
    n 1: a soft lightweight muslin used especially for babies

from The Collaborative International Dictionary of English v.0.48

Nainsook \Nain`sook"\, n. [Nainsukh, a valley in Kaghan.]
   A thick sort of jaconet muslin, plain or striped, formerly
   made in India.
   [1913 Webster]