I am accustomed to the Measurement used in the Garment Industry.
The Chest is Measured Just Below the Breast.
And then the Size of the Breast is the Cup size.
Cup size is Determined by the Difference between the Chest Size and the Over the Nipple Size..
http://www.youtube.com/watch?v=UoqXCnYOwCIBut there is no international accepted Standard..
So it's any Woman's Guess what Bra and Cup she should be..
So for example a 36B cup, would be 92CM measurement, with a Small Breast size.
And a 30DD, would be 76CM, with A Large Breast size.
The missing Information that isn't presented from VG is the Cup Size.
One Chain, Victora Secrets..
Use a Different Measurement System.
The Chest is Measured Above the Breast, Not Below the Breast.
And An Above the Breast Measurement will be 4 to 6 inches greater than the Below the Breast. 10 to 15 CM larger.
So women Who are used to a 30D, will get a 36D from Victora Secrets.
http://www.victoriassecret.com/bras/how-to-measure-bras