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How do you measure a dress/gown to determine an approximate size?

I have a ball gown I would like to sell, but it's only size labeled is "Medium" and it's been altered a bit. So far, my search for help has only led me to how to measure oneself and not the gown. I can attempt to hold the gown and try to measure those areas (bust and waist) in circumference but there has to be an easy trick, right?

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