We use the traditional plus four or five inches system. A lot of fuller bust companies add no inches or 2 inches only rather than the plus four or five. This is really a matter of preference of the company making the product as the actual physical size of the bra will be the same just the size it is called will vary. So for example someone who is a 30H in a brand that uses the newer system would be a 34F in our system. However the actual bras would be similarly proportioned and it is not that you are truly one size or the other.

Neither system is right or wrong but as a customer it is key to know what system the company you are buying from is using so that you get a bra that physically fits you.