Do the sizes in the chart represent the coat sizes with room built in for the other layers? I ask because I'm slightly below average sized and the Small in the chart seems bigger than me, except the sleeve length? The neck sizes are a little confusing as well, as I'm sure we're all used to measuring for shirt collar sizes, so anywhere from 15-20 inches is pretty common. I know you said you'd reach out to us individually, just trying to make sure I'm ready when you do. Thanks!