This past weekend's project was creating a cardigan from a Cabela's pullover. My pullover is in cream, but the same as this berry colored one. I cut it straight up the front, removing the small zipper and sewing in a separating zipper from Joann's Fabric. Turned out fine. I sewed the zipper in by laying it down face down on the right side of the top, then sewing it up with the narrow zipper foot on the Viking 770. Then I did the same on the other side of the zipper - a bit more tricky. Thus the edges were finished at the same time as the zipper was sewn in. I may do this on my other pullover which is the berry color in the photo.
Small mention of Project Runway related content! Chris March has a blog at the Project Runway website. He is just so right about this season. Moreover this has been the most boring and worst season ever. Hope to see some improvement after reading the Threads article.