As you can see, I've made a somewhat successful attempt to match the striping. With Noro yarn, that can be the impossible dream. But it's close enough and probably won't be noticed if I keep my arms down while wearing it. Not that I walk around with them over my head, of course. Matching gets a bit trickier on the upper front where I tried to attach the second ball of yarn at just the right spot.
The pattern says to join the right shoulder seam and then pick up stitches to attach ribbing, which would involve joining the left shoulder seam along with the ribbing at the end. I wonder if it would be okay to join both shoulder seams and pick up the ribbing in the round? Or would it not lie properly flat? Please comment if you have any ideas on this.