There is no measuring method that can always return your accurate bra size. We all have unique body types and sometimes, we need help from ‘Sister Cup Sizes’. The cup sizes are also graded so cup size of 34B and 36B are different. As the band size increases, so does the cup size. Therefore 34B is same as 32C or 36A. Here’s a bra sister size chart to help you slip into the perfect one!