This isn't really about vanity sizing though, but rather the amount of mental gymnastics required for that specific obeast to reach the conclusion that trying to be a smaller size doesn't matter. Besides, the bigger you are, the bigger the size discrepancies. I think most shitladies would agree that in most female clothing stores (excluding the ones that cater to fats), we aren't faced with that much size fluctuation. I'm either a US 2 or a 4 in most stores (I'm in Europe, so 34/36).