Here is a comparison image of aa left and a right cups on the same band size. If you measure 78 centimeters only a difference of 1 centimeter you would likely choose a band size 36. A well fitted bra can totally make or break an outfitbut figuring out how to measure your bra size is not easy. Here a definitive 5 step guide for how to measure your bra size at home. If its odd add 5 instead. You can also see that you are close to band size 36.
Bra wearers can calculate their cup size by finding the difference between their bust size and their band size. The band or frame size is the firm circumference fitted not tightly measured directly underneath the breasts. Then wrap some soft measuring tape around your torso directly under your bust where your bra band is. To measure your bra size first stand in front of a mirror with a non padded bra on. Next measure loosely around the fullest part of your bust. The bust size is the loose circumference measured around the chest over the fullest part of the breasts while standing straight with arms to the side and wearing a properly fitted bra.
The size difference between an aa cup bra and an a cup one really depends on the brand but will be no more than the difference between an a cup and a b cup. If this measurement is even add 4 to get your band size. The bust size bust line measure or over bust measure is the measurement around the torso over the fullest part of the breasts with the crest of the breast halfway between the elbow and shoulder usually over the nipples ideally while standing straight with arms to the side and. If you look at the chart you would have a band size 34 and a cup size aa. Use the following to convert the bra sizes betweem different locations.