Bra Sister Size means the same cup volume, but with different band sizes. This is due to the fact that bra volumes are relative, which means that a 34B has the exact same cup volume as a 36A or 38AA. Bra Sister Sizes can help you find the perfect fit if your current size doesn’t feel quite right.
Why Do I Need to Know About Bra Sister Sizing?
Understanding bra sister sizing makes it easier to find the perfect fit for your body. It can be especially helpful when shopping online [1], as you may not have access to a range of sizes in store or may have difficulty finding one size that fits properly. Knowing about bra sister sizing gives you more options and helps ensure that you’re getting the right fit.
How Do I Know My Sister Size?
There are several bra sister sizes charts available online, which provide information on the different sister sizes for any given bra size. Generally speaking, to go up in cup size while keeping band size the same, you should move one letter higher (i.e., A → B). To go down in cup size while keeping band size the same, move one letter lower (i.e., B → A). And to go up or down in both cup size and band size, move the corresponding number of letters. For instance, if you want to go from a 34B to a 36A, you will move two letters higher in the alphabet and one number higher on the band size chart.
Sister Size Up
If you find that your current bra size isn’t quite right, you may want to try going up a sister size. This means increasing the band size by one number and decreasing the cup size by one letter. For example, if you are wearing a 34B, you can go up a sister size by trying a 36A.
Sister Size Down
If you find your current bra is too tight in the band, you may want to try going down a sister size. This means decreasing the band size by one number and increasing the cup size by one letter. For example, if you are wearing a 34B, you can go down a sister size by trying a 32C.
Confused yet? Here’s What You Can Do in a Few Scenarios:
Your bra band fits, but your cups don’t: Move one size up in the cup (e.g., from a 34B to a 36A).
Your bra cups fit, but your band doesn’t: Move one size down in the cup (e.g., from a 34D to a 32C).
Neither your bra cup or band fit: Move one size up in the cup and one size down in the band (e.g., from a 34D to a 36B).
You need more support: Move one size higher in both the band and cup (e.g., from a 34B to a 36C).
Remember, when shopping for bras, it’s important that you try on different sizes to find the perfect fit — and don’t forget about your sister sizes! With this knowledge in hand, you can confidently select the right size and feel supported all day long.