The letter a is the circumference in the bust while the letter b is the size under the 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. Wrap the tape measure around the body under the armpit and over the scapula or shoulder blades at the back and back to the front of the bust line. Measure the circumference around your upper bust by aligning the measure at the middle of your back just below the bust line it should at this point be parallel with the floor and then closing the tape over the top of your breast. So subtracting a from b will give us the result which we must then find in the table below. The band or frame size is the firm circumference fitted not tightly measured directly underneath the breasts.
Measure your upper bust. They match the three inflection points of the female body shapeit is also often used in womens personal ads or internet profiles to indicate their appearance. This should help measure breast fullness and rise. Bustwaisthip measurements informally called vital statistics and body measurements are a common method of specifying body proportions for the purpose of fitting clothes. Steps in measuring your body circumference measuring your chest circumference place one end of the tape measure at level of your bust on the fullest level. This is a simple result of action a b.
How to calculate the size of the bra cup. Distance from shoulderneck point to bust point. In summary if we have 75d this means that a womans bra fits for a woman with a circumference of 75 and a cup d. Stride crotch length plus 1 to 2. Distance between bust points. Length from waist to floor minus 1.