This is a fascinating pattern to knit! Incidentally, the colours in this photo are more realistic than the earlier ones.
It's all based on the number of stitches, and amazingly, mine has been correct all the way through.
When I've finished knitting the lower middle portion, I'll pick up some stitches that are currently on the holders which will form the front bands.
The top seam along the shoulders is the only sewing that is required - it is knit all in one piece.