This is a proportion grid. Genetically, humans have standard proportions. Tailors have used these for centuries to create garments from few physical measurements.
Hong Kong has a garment district where you can give the tailors your measurements in the morning, and come back later and get a suit that will fit (it is somewhat less than curvaceous, but rather boxy).
They all do this by plugging your few measurements into a chart like this one above or by memorizing standard proportions.
You can get the above chart here: http://cdn.shopify.com/s/files/1/0131/0182/files/Proportion_Grid.pdf?1471