What is “Sister Sizing”?

Everyone has more than one size option that will work for them when it comes to buying bras. A Sister Size is an alternative to your typical bra size where the cup volume stays the same and the band size and cup letter change. You can sister size up or down from your usual size to ensure you are getting a bra that fits comfortably. To find your sister size, see question "How do I find my sister size?"