Another example, a 34B and 36A are the same cup size. The only difference is the band size. The 36 is a bigger band size than the 34. Here's an example of some other sister sizes.
So a 36B is bigger in band and cup.
Therefore, the cup of 34B is the same as 32C or 36A. Knowing your sister size will help you in finding the right-sized bra for you.
Small: 32A, 32B, 34A, 34B. Medium: 32C, 34B, 36A, 36B, 36C. Large: 32D, 34D, 36D, 38A, 38B, 38C.
Another example, a 34B and 36A are the same cup size. The only difference is the band size. The 36 is a bigger band size than the 34. Here's an example of some other sister sizes.
As cup size gets bigger and moves in alphabetical order from the letter A onward, the bra cups become deeper and wider. Cup size is measured by the bust measurement (including the breasts) minus the rib cage measurement taken just underneath the breasts.
Medium: 32C, 34B, 36A, 36B, 36C. Large: 32D, 34D, 36D, 38A, 38B, 38C.
The difference between a 34b and a 36b is that the band size will be a little larger. Thank you. Helpful?
For reference, any cup with a 34 band size is considered a “true cup” size. 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.
If there's a 1-inch difference between bust and band you're an A cup; 2-inch difference is a B cup, 3 inches is a C cup, 4 inches is a D cup, and so on. For example, if your bust measurement is 37 inches and your band is 33 inches, you would be a D cup because of the 4-inch difference.
The 34B size is considered a medium-sized bra. It's not too big or too small, and it fits nicely in the middle of the scale. It's no secret that finding the perfect-fitting bra is a major challenge for many women.
34B is one of the most popular bra sizes in the country.
If your current bra size is 36A and you want to go down a sister size,it would be 34B. If you want a sister size up, it would be 38AA.
36A and 34B — they're both technically a B cup.
How Big Is 34B? A bra size that's 34B has an under-bust size between 33-34 inches and a bust size between 35-36 inches. Being a B cup means that your bust size is two inches more than your band measurement.
With sister sizing, a 34B would be equivalent to a 32C as well as a 36A.
When people talk about breast size, they often describe it in terms of bra size. The average bra size in the United States is 34DD. This figure can vary by country. In the U.K., for example, the average is 36DD.
Remember: if you go up a band size, you need to go down a cup size, and vice versa. (Ex: A 34C cup is the same as a 36B. A 40E(DD) cup is the same as a 42D.) Neither your cup or band fit: Go down a band size if they're both too big, or go up a band size if they're both too small.
A study conducted by Berlei lingerie reported the average breast size across Oceania to be a C cup, the same as Italy, France and the UK. The most popular bra sizes in Australia are 14C and 12D.