Women's sizing is complicated: there is one size for formal dress and one different size for off-the-rack clothes. I wear a size 0 at Banana Republic, White House Black Market, higher end stores (size XS/0 at stores like Target--and I have to take in the waist), and I measure for a size 12 (but make a size 8 usually, because there is typically lots of extra "ease" in the pattern itself) when I make my own clothing from sewing patterns.  Here's a "dress size"/traditional size chart: Vogue typical pattern size chart  By the way, Vogue totally shitlords on their website, making the black edge of the mobile site obscure the fatter sizes--because why would you even sew something that large? When the phone is held vertically, the mobile site even obscures sizes past 12!  So when that ham says she's a 8 in chest (of course she's trying to flatter herself by suggesting she could fit a 7) and 16 in the waist, she's obviously talking about off-the-rack sizes. Add about 12 to those sizes on that size chart, and she's measuring about 42" in the chest and 42" in the waist. She's basically got a chest of flabby undefined fat and a waist of gelatinous over-distended fat. Just one big tube of shapeless fat.  TLDR; noone wants to see that in a swimsuit