Wow this is full of information that is all over the place.
In my practice, when we see patients, this is the chart we use which is standardized medically and does not consider all the wild variations of clothing manufactures. In other words, you cannot accurately rely on clothing manufactures as there is not an industry standard for calibration.
Instead, we measure our patients both with measuring tape and scales. We then cross reference that with the industry standardization for each category (US, UK, EU, JP). The most accurate, and easy to understand is the EU standard. Also, for those that do not know 1ml volume = 1cc cubic centimeter.
Again, and to be clear, there are industry standardization for size but there is not an industry standardization for calibration in textile manufacturing. That means that manufacturers loosely approximate size but don't have an "official sizing tool" which is why a US 38G from one manufacturer may be bigger or smaller than the same size from another US manufacturer. The issue exponentiates when you look at other manufacturers world wide.