I am just a beginner knitter, but I knit a Wallaby and they had an option to add a collar instead of a hood. That is what I wanted,
They had me go back and do increases to the back edge of the neck opening and then I knit a 2" garter stitch collar flap. the collar turned out real nice, lays nice. I think this sweater has what may be called a placket V front.
If that helps at all.