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Cup Size
(Chart below is based on a 32" band measurement.
Please see below for complete measuring instructions)

  Read the guidelines below and then compare your measurements to the above size guides. For the best fit, wear little or no clothing while measuring, and use a fabric tape measure.  
  Band: Take a snug measurement around the rib cage directly under the bust. Add 4 inches if the measurement is even; add 5 inches if the measurement is odd. If the rib cage measurement is 36" or higher, add 2 inches if the measurement is even and 3 inches if the measurement is odd. As a check and balance, take an over-bust measurement: Measure around the body from the center of the back, up under the arm, to the middle of the chest wall above the bust. This number should be close to the band size you determined previously.
  Cup size: Measure around the fullest part of the bust, making sure the tape measure lies flat around the body. The difference between band measurement and this measurement in inches will determine the cup size. (Note: this measurement is most accurate when you wear an unlined or slightly contoured bra.)