A glossed silk fabric with a ribbed pattern, used from the 14th to 16th centuries. It applied specifically in the 17thC to a form of taffeta which was stretched and then coated with a glossy gum. Lutestring or lustring was used in the 17th and 18th centuries particularly as a dress fabric and for bed and window curtains.
Found on http://www.antique-marks.com/antique-terms-l.html
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