I really don't think you can go by sizes. It's how you look in a size. There is a site (maybe someone will point it to you) that shows different people at the same weight and height and how they all look so differently from each other.
Like, my size 8 is pretty thin for me. Size 8 on a smaller boned person of the same height might be a bit chubby yet.
Restart 5/18/15 began at 263.9. All time high was 275 in 7/03. Low in Summer 2012 of 169.