Sister sizes are one of the reasons that I rarely give a straight answer when a client asks me what her size is. This is terrific information! I have always wondered and looked for good explanation of this! Thank you! That is sometimes the case! Save my name, email, and website in this browser for the next time I comment. Exchange Policy. April 29, Cappuccino, by Ewa Michalak.
Lucy, by Cleo. October 30, Bra size has two measurements; the band rib cage and the cup bust. Cup size does not represent breast size but instead represents the difference between the rib cage and the bust. The band size is measured numerically e. The cup size is measured alphabetically e.
The grey cells in the table below demonstrate how the sizes diagonally adjacent from the top right to the bottom left are the same in breast volume i. That is when the wrong size is still the right size.
Sounds complicated? To sort out what sister sizes are, we first need to go through how the bra sizing system works. A bra has double sizes — the band size measured directly under the bust and given as a number, for example 38 and the cup size given as a letter, for example B-cup. The cup is always proportional to the band size, i. A B-cup with a 42 band size does not have the same volume as a B-cup with a 34 band size. The fact is that if you fill the cup of a bra of size 40B with water, it will hold the same amount as a bra of size 34E!
C-cup is not the same in all sizes. Sister sizes mean that the volume of the cup is the same in several band size s. For example, 38C has the same size cup as 36D and 34DD. This means that if you try a 34E-cup and think that the cup fits well but that it is too tight around the back, then you can try a bra with a 36 band size. But instead of trying a 36 with an E-cup, choose a 36DD instead.
It is only the band size that has changed. If you try a 36E, the cup will be too big but the bra will fit you well around the back. The table below shows the relationship — the orange fields have the same cup volume. The rule of thumb is simple — up one band size, down one cup size. Down one band size, up one cup size. This is what is called a sister size — 38C is the sister of 36D and 40B. If the bra has an elastic back, you can probably also wear a 36D as it will stretch over time and adapt to your body.
If you think that 36D is too tight around the back you can simply increase the circumference by a few centimetres using a bra extender in the hook and eye fastening. You can thereby wear a 40B on the innermost fastening so that is a little tighter.
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