Sister sizes are alternative sizes that offer similar cup volume, so you can adjust your band size and still get a comfortable fit!
For example, if you’re a 34D, you can go up a band size and down a cup size to 36C, or down a band size and up a cup size to 32E, and find that all three sizes fit you nicely.
In this example, 36C, 32E and 34D are all called ‘sister sizes’ as they would all fit the same person just as well. This can help give you more options in case the style you’ve been eyeing is out of stock in your original size.
You can calculate your sister sizes yourself, or find them by consulting our size charts on any one of our product pages.