So far, I would describe my efforts to put a zipper into the Jailbird Cardy as Semi-Successful. My zipper is in and it looks great, but I sewed too close to the edge and the fabric catches in the teeth as I try to zip it up. Also, the sweater is now too big. And it still rolls up along the bottom edge. I don't think I'm going to be wearing this thing to work, but one can often use an extra layer while camping, so I'll re-stitch it sometime. All in all, I would call this a Good Learning Experience.