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.
One day in LA, my co-producer and I went into The Gap and a number of other stores. Instead of being my usual 6/8, I had somehow become a 2/4, numbers which I had never seen before on clothing tags. What was it that prompted designers to change their sizing codes in North America?