A cubic metre is a unit of capacity. A kilogram is a unit of mass. The two units are incompatible. And in any case, you would generally not measure a two-dimensional solid material, such as cloth, in cubic metres.
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To convert cubic meters of clothes to kilograms, you need to know the density of the fabric. Once you have that, you can multiply the volume in cubic meters by the density in kilograms per cubic meter to get the weight in kilograms. Without the density information, it's not possible to provide an accurate conversion.