Start by standing in front of a mirror wearing your best-fitting, non-padded underwire bra. You'll also need a soft measuring tape. Remember to measure in inches.
Stand in front of a mirror and measure around the fullest part of your breast.
In order to get the cup size, you would need to subtract the bust measurements from the band measurements.The measurement you identify is your band size in inches.
Ribcage: measure around the fullest part of your breast.
Waist: measure around your natural waistline, keeping the tape comfortably loose.
Hips: stand with your feet together and measure around the fullest part of your hips.