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20:08 Sep 11, 2014 

This way of expressing the weight of fabrics is peculiar to the EN-speaking world, and I am unaware of an equivalent in countries using the metric system. Since no-one is very likely to be actually measuring these 8 oz (unlike the situation with, say, a cookery recipe), I feel it would be best to retain the original units without conversion.

If you did choose to convert, say for comparison purposes, do be aware that the metric equivalent might well need to be in g/m², so a simple conversion of the original weight probably wouldn't work (and could even lead to confusion).