I bought 7 meters of blank cotton, just to try the drafting process for the first time without wasting expensive fabric. I followed the video and the waistcoat turned out too big and with huge ***** of extra fabric on the line between my belly button and shoulder point.
I took the prototype apart and turned everything above the line between my first button and the bottom of my armhole away from the neckpoint so that the shoulder point was an inch further out. I figured that would pull the slack out of the chest, and this is the result! I'm very content :)