Programming Algorithm for cup size?

Jan 2, 2019
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Ultima Thule
Hello, I've been working on an adult game for several weeks now. I want it to have several different races of randomly generated slave girls the player can train.

In case anybody doesn't know yet, cup sizes are determined by the difference between two measurements. The circumferences of the chest just below where the breasts begin to swell (the underband measurement), and across the breasts themselves.

I want to model this, but the various races in my game are all different heights and weights. So, I need a formula or a graph to tell me what underband measurement typically goes with what height and weight.

I know I could just have a rough indicator of breast size, but I want all the girls measurements to be as specific as possible.

Thanks for reading.