Dress Sizes - Frustrating!

It's strange, but over the past 20 years I weigh a little more now (just a little). But, I wear the same dress size. Hmm... Could it be that dress sizes have increased? I have noticed in buying clothes they very from one chain to another. I have heard that Nordstrom's sizes are bigger than other stores. And of course they vary from style to style.

Unfortunately I have the same problem, especially with the Girl's Chinese Dresses and the Vietnamese Girl's Ao Dai's. That is why I measure them and put that in the description. The sizes run to the small size. So until I manage to have my own dresses made for the Chinese and Vietnamese styles, measurements work best.