Do you think is true about the women's ideal size?

I don't agree or oppose, I just don't know for sure and I don't know who's survey is this or what's it based on. I'm just wondering. I found it online browsing through the mighty nothingness of the interweb, and I think some people would disagree. I for sure - know- that many-many people are asking for L, XL and 2XL size shirts or were asking before on our etsy page..
What do you think?