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Calico - a thin, dense fabric usually made from cotton or linen yarn, treated (for example, with a solution of natural resin) to obtain a smooth surface, and more or less transparent, used for drawing by architects, draftsmen, etc.
Source: "Explanations to the Harmonized Commodity Description and Coding System of the Customs Union (HSN CU)" (Volume 3. Sections IX - XIII. Groups 44 - 70)