The circle will be easier to cut. But that IS why I offset the neck hole, that will cause the shoulders to stick out a bit more and the back to be longer. Which wouldn't happen with an oval.
About 7 inches in front and close to 9 on the shoulder(Which I measured to be close to correct, albeit without any armor underneath).
The image isn't prefectly acurate. Not sure if the neck hole is too big/small.