Why do busty, ample, voluptuous women more often have larger body weight?

No offence, rudeness intended.
You don't see many slim/thin/athletic/average size women that are busty/ample.Why do busty, ample, voluptuous women more often have larger body weight?
I think everyone's differeent...I'm 5'1....and I'm a size 8 (in the UK) which isn't a big dress size, but I have size 34D cups...which are big bust sizes....
I just think everyone is different.
Breasts are made of fat. The less body fat you have the less breast tissue.
this question doesnt really make sense. are u asking why some women are larger and some women are not? umm, because women are of all different shapes. we are not all made the same. obviously it is more likely that someone who is very thin will be small all over, and won't have huge cleavage. obviously there are exceptions but its just unpredictable. some are lucky to have an hourglass figure. theres nothing else to say about it really.
Breasts are made up of fat, so normally if you are overweight, you are busty, if you find someone with a large bust who is thin then she has a very padded bra or they are fake, sorry if I offend anyone, I guess there are your rare cases.