How do I find my sister size?

To use the chart below, first find your typical bra size in the table. If you aren’t sure what size you are please review our Bra Size Calculator. Your sister sizes will be the two options to the right and to the left of your size. For example, if you are typically a 34D, your sister sizes will be a 32DD, which will be smaller in the band, or a 36C, which will be larger in the band. Cup volume will stay the same on these two sizes, although the cup letter changes.

Sister Size Chart
Sister Size Chart

Sister Size Down - If your typical bra size is fitting best and feeling the most supportive on the tightest band hook when you first try it on, you might want to consider trying your Sister Size down instead. Your Sister Size down will have the same cup volume as your typical bra size, however will be one band size smaller offering a tighter fit. For example, if you wear a 34C, your Sister Size down would be 32D.

Sister Size Up - If your bra is on the loosest hook and feels tight then you might want to consider your sister size up. This is one band size larger than your current band size. Again, the cup letter changes but the actual volume does not. For example, if you wear a 34C, your Sister Size up would be 36B.

Remember, all brands and styles of bra will fit slightly differently, so it's a good idea to try a few different sizes to find what works best for you. The most important thing is that you feel comfortable and supported!

For a perfect fit, you may also try the tips below:

  1. Cup just right but band too big? Try your sister size down.
  2. Cup just right but band too small? Try your sister size up.
  3. Spilling over in the cup, but band feeling good? Stick with the same band and go up one cup size.
  4. Cup gaping and band too big? You should try one cup size and one band size down, ie one full size down.

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