Okay, this is a little fun but, the idea is having a standard to categorize the girls while keeping awareness of some real life data.
Sure, can't be exact so we're using flexible yet easy to understand definitions and numbers from real life plus big adjustments on real life standards that will serve new purposes inside the Deamore's Universe.
With that in mind, we have most of the important body types in the story and give them extra definitions, group some body types and create "new ones", something needed since our girls have their own models limitations.
Like the bodies, cup sizes have real life links but are dramatically fixed, so, no infinite sizes like ZZZ or DD, AA, BBB hiper limiting definitions, we go one letter straight proportional to the body/height giving proper proportion knowledge. My girls shapes are limited to only 3 major morph kits that use all the available morphing channels, I can't push even bigger (for now at least). Also fixing the density to 75% of water, different to real life that is around 90%.
Example: Giselle is Amazonian Long Legs H cup - 8'11" (272 cm) Tall, weights 540 pounds (244kg), each breast volume is v17 liters (≈13 kg), both breast stats vv34 liters (≈26 kg).
Again, the CUP size is proportional, meaning we can have a H cup that is 5 foot tall and 15 foot tall, meaning visual expectative will be met. And you can freak out how massive breasts are on bigger girls.
The volume is defined first visually then transferring the scales to a table that calculates it, but visual key to be sure of the cup proportions will be set later: the main rule here is Giselle with the H cup because it is as big as her head so, a good reference from a beloved character.
And there you have it, number freaks, we can now calculate the girl's body mass - though it is not easy to calculate since I need real life body references for each model - and it is even intuitive for average readers.
Have fun with it and, I'll be accepting suggestions for improvements and comments on the issue.