The bra size obtained using this formula should not be regarded as definitive, particularly for larger cup sizes. In many cases it is not possible to accurately predict bra size using measurements alone. The actual volume of each cup size increases with the band size. In fact, most bra manufacturers use the same cup volume for bras which are related by an increase in cup size and a decrease in band size. For instance, the cup volume is the same for 30D, 32C, 34B, 36A, etc. It is for this reason that bra sizes have sister sizes which are related by having the same cup volume, as shown in the image to the right. Although it is important that a wearer has a correctly fitting bra, it is sometimes possible that two adjacent sister sizes both fit reasonably well, since the cups are the same size, and the difference in band size can be accommodated by fastening the back on a different hook. However, fastening a bra initially on the smallest adjustment does not allow for tightening the band as the fabric begins to lose its elasticity.[9][6] [edit] Variations Most countries (in particular most of Asia and Europe) use centimetres rather than inches. In Australia and New Zealand dress size is commonly used instead of band size. [edit] New European system The European dress-size standard EN 13402 defines bra sizes based on the following two body dimensions (measured in centimetres): bust girth  maximum horizontal girth measured during normal breathing with the subject standing erect and the tape-measure passed horizontally, under the armpits (axillae), and across the bust prominence (preferably measured with moderate tension over a brassiere that shall not deform the breast in an unnatural way and shall not displace its volume) underbust girth  horizontal girth of the body measured just below the breasts Bras are labeled with the underbust girth (rounded to the nearest multiple of 5 cm), followed by a letter code that indicates the cup size = bust girth − underbust girth according to this table defined by the standard:

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