Since I don't like seaming, I decided to make two identical 'backs' and join them thus, with a three needle bindoff. From here I will knit upwards to the underarm, separate the knitting into back, and two fronts and go on to the shoulders. I will again join the shoulder seam with three needle bindoffs.
Miraculously the yarn changed color at exactly the right spot, no planning on my part! That center yellow stripe is the bindoff seam.
This is the back side with the visible bindoff. I worked up to 36 stitches. I think this will be a smaller size. But it could change with blocking.