How To Measure Your Bra Size?

Bra Sister Size Chart – How It Works

Sister sizes are alternate sizes where the cup volume stays the same even when the band size and cup letter changes. Using a sister size bra is effective as it fits more perfectly for women who feel uncomfortable wearing the original size bras. In a sister size bra, the bra cup sizes are denoted as letters (A, B, C or D) and the band size as numbers (32, 34 or 36).