[Heaven's Night]

There's a good point there about the measuring tape. Also, tape doesn't know a thing about three dimensional soft jiggly thing, it only does the numbers in one direction. Note about shape which almost everybody makes a mistake upon. Narrow and projected shapes are perceived as bigger than they are quite easily. And the opposite for shallow and wide shapes. Top heaviness and sagging make them look bigger. Perky and bottom heavy boobs look smaller. Wide roots with ton of sideboob looks smaller than it is as sideboob is a flatter shape and often hidden by the front/projected part.

Implant enhanced boobs often look smaller than they are, bra size may jump by a lot after getting a implant BA, but high profile high set ones look bigger. Lower profile low set ones look smaller, its the same thing that makes the difference with top vs. bottom fullness.

The point is, perception is not the same as volume and different shapes make meausuring tape behave in certain ways which can skew bra sizing and comparison to size/volume charts.

For example, my meausrement of 42LL/95LL corresponds to 7000ccs total on the chart, in reality its likely a bit less as I always measure a bit larger than what fits me the best, and also every bra manunfacturer does their thing a bit differently. So what I talk about are estimates. The water displacement method is interesting though, I should try and see how it works. I presume that I will likely miss some volume which comes from side and top part as there's no way that side of breast root could reach the water... Shape issues again, someone with narrow and projected breast root get this done way more accurately.