Ready-to-wear clothing has become bigger over time. In the 1937 Sears Catalog, a size 14 dress had a bust size of 32 inches. By 1967 those sized boobs snagged you a size eight frock. In 2011, you and your little B cup breasts get a high five from the girls at the gym because you wear a size zero. I think Vanity Sizing is just another marketing/shaming tool.