To judge the size of your underwear cup, you can measure and calculate it by following these steps:
Prepare a soft ruler (also known as a tape measure or cloth ruler).
Measure the lower bust:
Wrap the ruler horizontally around the underside of the breast, where the lower edge of the breast begins, usually on the line where the breast tissue begins (for most women, this location is near the upper edge of the ribs below the breast).
Take care to keep the ruler snugly against your body but not too tight, and take note of the measurements at this point, which is your underbust size.
Measure the upper bust:
The ruler goes horizontally around the highest point of the breast, which is above the nipple position, so that the ruler passes through the fullest part of the breast.
Also keep a moderate amount of tightness and take note of the measurements at this point, which is your upper bust size.
Calculate cup size:
The difference is about 10cm for the A cup, and the difference is 12About 5cm is a B cup, and the difference is about 15cm is a C cup, and the difference is 17A D cup of about 5 cm is a D cup, an E cup with a difference of about 20 cm, and an F cup or more if the difference is more than 20 cm.
Subtract the upper bust size from the lower bust size and the result is the difference in cups.
The correspondence between the general cup sizes is roughly as follows:
Combined with the underbust size and the calculated cup difference, you can check the underwear brand's size chart to determine the right underwear size. For example, if your underbust is 70 cm (equivalent to 32 inches) and the difference between your upper and lower bust corresponds to a D cup, your underwear size might be 32d.
It is important to note that there may be size differences between different brands, so it is recommended to use the size guide provided by the specific brand and try it on yourself to ensure the best comfort and fit.
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