bra animation. Text: Sister Sizing - Manufacturers and retailers have a sister sizing system, where some bras have the same cup volume - but different band sizes. For Example, if your true size is a 34B, but the fit isn't perfect, you can try your sister sizes of 32C or 36A. As one size goes up, the other must come down. If your band feels too tight, you'll go up in band size, and down a letter in cup size. If your band feels too loose, you'll go down in band size, and up a letter in cup size.
