If you want to know about your size we recommend starting with our Fit Finder®.
If you would like more information about how bra sizing works when your current bra's band or cup do not fit well, below is an explanation on how the adjustment works.
Based on how tight your current bra's band is, we may recommend that you change your band. Similarly, based on whether you feel your current cup feels too small or too big, we may recommend that you change your cup.
If we adjust your band, even if your cup size remains the same, you may notice that your recommended bra size letter has changed. This is because the way bra sizes work - cup lettering changes relative to band size. This is known as sister sizing.
A general rule of thumb is when you go up in the band, the cup letter gets smaller. When you go down in the band the cup letter gets bigger, even when your cup volume has not changed.
Here is an example on how to adjust the band and cup with a size 34D with a bra sizing chart:
Cup fits but band is too small: Going from a 34D to a 36 band would bring your size to a 36C. When you go up in the band, you go down in the cup letter but the volume of the cup stays the same.
(Note: Again, because of the way bra cup sizing works, different cup letters can have the exact same cup volume, depending on band size. What this chart shows is 30F, 32E, 34D, 36C, and 38B all have the same cup volume.)
Cup fits but band is too big: Going from a 34D to a 32 band would bring your size to a 32E. When we go down in the band, you go up in the cup letter but the volume of the cup stays the same.
Band fits but cup is too small: To increase the cup size, go up in the cup letter from a 34D to a 34E.
(Note: On a bra sizing chart, if the band feels great but the cups are not fitting well, you take the cup letter up or down in alphabetical order depending on whether you need a larger or smaller cup size.)
Band fits but cup is too big: To reduce the cup size, go down in the cup letter from a 34D to a 34C (alternatively, if the cup is just slightly too big, you can also try 34C1/2).
Cup & band are too small: Going up in the cup and band from a size 34D would bring you to 36D. Don't be thrown off by the same letter. The cup volume on size 36D is a cup size larger than a 34D.
Cup & band are too big: Going down in the cup and band from a size 34D would bring you to a 32D. Don't be thrown off by the same letter. The cup volume on size 32D is a cup size smaller than a 34D.