I've completed the lower body section of the Einstein Coat, with modification. The bottom part is 14" long and the upper body will be 18", almost the reverse of Sally's design. I picked up all 137 stitches along the slip-stitch edge and will knit the full width of the garment until the under-arm portions are bound off. Then, I'll work the upper left front, upper right front, and back separately.
Because of these changes, I put only one buttonhole in the lower body portion, 2" from the pickup edge. The remaining 5 buttons will be in the upper body. My gamble in all of this is that there will be enough yarn. I bought 8 skeins when I was doing the child's large size. If I end up short, I'll find more and use them for the sleeves and the collar.