You just hit on MY pet peeve, lph. I loathe when they actually do have a size chart with numerical measurements of chest, waist, hips, etc...and the numbers on the chart are also vanity-sized. Like per the numbers on Gap's size chart, I should wear a 4-6 in their jeans...in reality, I fit a 0-2.

I am by no means a size 0. And only rarely a 2 (like, maybe for skirts that aren't fitted through the hips).