I placed my tracing paper under my original pattern and redrew the neckline. This was somewhat of a guess as to what I thought looked right. After I completed the top, I found a discussion on Patternreview.com about drafting cowls which indicated that if you draw a line straight across the shoulders, you should drop the front neckline about 4 inches. Lucky for me, that is exactly how much I dropped mine!
For the cowl neck, I cut a rectangle about 15 x 24 wide. The circumference of the cowl after seaming should match the distance around the neckline. (Actually, mine was ever so slightly smaller to help hold in the stretchy neckline) My neckline circumference is about 22 1/2. I allowed a little extra for shaping at the back seam. I first stitched a straight seam and tried on the cowl. I decided that it would be a good idea to let out the part which would be the fold on the cowl to make it a little looser and give it a little more fabric to "cowl". I tapered back to the original seamline keeping it at 22 1/2 .
Once I had all the adjustments made, I sewed the top up very quickly with my serger and Janome coverstitch machines. If the lightweight jersey didn't roll, I could have it stitched up in about an hour. Does anyone have any tips for sewing with knits that roll?
I plan to make several more of these in other colors. I have always enjoyed sewing with knits but REALLY enjoy it now that I can get professional (and stretchy) hems with the coverstitch!