Women's sizing is so dumb. They could just provide inches or cm like they do for the men, but for some reason (well for marketing reasons, as discussed extensively in the article), they use these random sizes and numbers that aren't consistent and change over time.

I think this is why stretchy materials are getting more and more popular. The women in my house use stretchy pants almost exclusively, because they are much more forgiving with body shape. As long as the waist fits, the rest will fit well enough.