The definition of oz.
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If the weight is given in ounces, then it denotes how much the cloth weighs per "running yard." Most cloth is woven in 60" widths, with selvage on each edge to prevent fraying. Typically, two inches are subtracted to account for selvage. Hence a "running yard" is 36" by 58". Thus 13 ounce cloth means that one 36" x 58" piece weighs 13 ounces, or thereabouts.
The same principle applies with grams and meters. Metric measured cloth is typically 150 cm wide. Subtract 5 cm for the selvage. The weight in grams is thus what one 100 cm by 145 cm piece of cloth weighs.
It's unusual, but not unheard of, for cloth woven in 60" widths to be weighed in grams. It's much rarer for cloth woven in 150 cm widths to be weighed in ounces. In fact, I can't think of an example of the latter.
The same principle applies with grams and meters. Metric measured cloth is typically 150 cm wide. Subtract 5 cm for the selvage. The weight in grams is thus what one 100 cm by 145 cm piece of cloth weighs.
It's unusual, but not unheard of, for cloth woven in 60" widths to be weighed in grams. It's much rarer for cloth woven in 150 cm widths to be weighed in ounces. In fact, I can't think of an example of the latter.
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