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countable and uncountable, plural nainsooks
A soft, fine muslin of South Asian origin, sometimes used to make baby clothes. quotations examples
Smocking done in colors on fine white batiste, silk mull, or nainsook makes pretty guimpes and dresses for children and very smart blouses for women.
1916, “Smocking”, in The Dressmaker: A Complete Book on All Matters Connected with Sewing and Dressmaking […], 2nd revised and enlarged edition, New York, N.Y., London: The Butterick Publishing Company, page 29