US standard clothing size

US standard clothing sizes were developed from statistical data in the 1940s-1950s. They are similar in concept to the EN 13402 European clothing size standard. However, as a result of various cultural pressures, most notably vanity sizing, North American clothing sizes have drifted substantially away from this standard over time, and now have very little connection to it. Instead, they now following the more loosely defined standards known as US catalog sizes. These are on average 6 sizes larger than the original standard. So, for example, a size 12 on the old standard would today be described as a size 6, while a size 6 on the old scale would be what is today known as size zero.
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