Japanese Dress Sizes
Japanese dress sizes are sometimes displayed in a set of 3 of numbers and letters. This is more common with formal wear, higher end brands, and sellers that make custom sizes.
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The first number is your chest size.
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One or two letters that determine your hip circumference relatively to your chest.
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One or two letters that indicate your height.
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For example, you may see the size displayed as "27-B-R" or "23-AB-T"
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Let's break down what each of those measurements mean.
Chest:
The first number in dress sizing is the measurement of the bust circumference. This measurement should be taken over the largest part of the chest. Take your measurement while wearing your undergarments (especially if you wear undergarments with padding).
Hips:
The second part of the Japanese dress sizing standard is used to define your hip circumference. In Japan, this measurement depends on your chest size.
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The designation "T" means that your hips are less than or equal to your chest size. All other templates are made for women who have hips wider than their bust. Thus, the letter "A" means that your hips are greater than your chest by 4 centimeters.
Dress Length:
The last part of the dress sizes naming is based on your height. Be careful, because the sizes above "P" (Petite) also add a few inches at the hips level (to compensate for curves). You will have to take this detail into account when calculating your hip circumference. It's the unique subtlety that makes the calculation difficult.
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There are other measurements above "T", but many brands have their own measurement standards. If you are taller than 166 cm, you may need to ask for more information.