This means that a 34AA is in fact a AA cup, just as how a 34B is a true B cup. However, a 34B is also equivalent in cup volume to a 30D, 32C, and a 36A. All three aforementioned sizes are a B cup despite what their cup letter indicates. This is called sister sizing.Feb 20, 2019
Is 34AA smaller?
And, there is also a common misunderstanding that the cup sizes are the same for each band, meaning that a 34AA cup is the same as a 36AA cup. The 36AA cup is bigger than the 34AA cup so it is really important to get the band size down and then figure out the cup.Feb 20, 2013
What is the smallest bra size?
Generally, the A cup is considered the smallest available but for some this is still too big and compensating with a smaller band size won't help. If you want something that's going to fit your form you'll have to go down a level to an AA or even AAA cup.Oct 24, 2019