I'm not sure that it has anything to do with how big we've gotten, just that they're using a different a scale when sizing the clothes. If I buy anything today I have to buy a 'large', and if it has bust darts, then I have to get an 'extra-large', yet I have several blouses that I bought years ago that still fit and they are sized '12' or 'medium'. And yes, my bust size has gone up, but not that much.

I ordered new pants for work, I'd gained a little weight, so I went up a size, from a '14' to a '16'. When they came, they were smaller than the pants they were ordered to replace. The whole 'sizing' thing makes no sense anymore.