Swiss muslin

Swiss muslin
a crisp, sheer muslin that is constructed in plain weave, bleached white or dyed, and often ornamented with raised dots or figures (dotted swiss), used chiefly in the manufacture of curtains and women's summer clothes. Also called Swiss.

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Swiss muslin,
a kind of thin muslin often with raised dots or figures in various patterns, used especially for curtains; Swiss.

Useful english dictionary. 2012.