Forget the tape mesure. The developement of breasts is far more complex, than that. I did it [use a tape measure]; and long ago, gave up. The measurement did not corrolate to what I was seeing. Just trust your visual judgement. A tape measure cannot tell you the size of your boobs, from top to bottom, or how the fat is distributed. I have been a 38B for a long time but, recently I have seen dramatic changes, in my profile; it is now totaly female, not just in the boob departement, but in stomach & hips, as well. At this moment, I am wearing a dress, that is an iminnent donation to a charity shop, because of my growth, yet my bra size is the same, as when I bought it.