The yoke will continue in garter stitch until the end. There's no ribbed neckline, so it'll be a bit of a roll-neck. The underarms will be kitchenered. I'm following the directions for the small size with a few stitches extra at cast on to account for a slightly small gauge. It's about 37" around the chest, so it'll have about 2-3" of positive ease. Of course I had to mod the math for the decrease rows in the yoke, but it worked out very nicely! Can't wait to see it on him!