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plz tell me how to find out(how to caculate) piece consumtion formula
If the fabric has no label, you can do a "burn test". Burn tests are complicated and somewhat dangerous, and you need a chart of what each fabric does when burned. Try googling "fabric burn test".
You tell me
Features and construction.
Generally, if the fabric has been made into a garment, the label must state the fibres and its percentages. Without the tag, it may be difficult to ascertain percentages.
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It means to tell about how it is made.
you tell me you the 1 who asked dummy
i have no idea you tell me
It means to tell what the formula is
if the bag is leather, the leather eventually becomes weathered. and if its other fabric material, the fabric becomes darker.
Put an = sign in front of the formula.