When manufacturers state cup sizes they lie... Simples.
Just look at a 166C's breast next to a 151C's and straight away you will be shaking your head.
You may find my chart that we used with the Jinsan bodies thread useful
The figures in the chart are not all generally published data but also corrections applied from owners.
The height to weight ratio is my addition. for those wanting taller dolls that don't break your back lifting them thats one of the key measures. General rule there is the lower the ratio the better.
The list hasn't been updated for some time. Nothing under 148 is included and the very newest WM's, YL's and OR's will be missing. I will add those when I get chance.
HTH,
Shamus.