The Stash Jacket is a variation on the Basic Body Shape Jacket. The back is worked side to side and the fronts are worked from the shoulder down. Mix yarns, just make sure that you do your gauge on each combination of fibers.
This vest is another variation on the Basic Body Shape Jacket. Shorten the shoulder measurement, then add the shortened inches to the underarm measurement when you calculate the number stitches needed to join to work for the body.