So, in the pursuit of the craft, here are some updates on the coat. The front bands are behaving better after application of Petersham ribbons, but they are still somewhat uneven. I now realize that this is due to stitches being pulled in by cable patterns. I could have applied wider petershams. I might try that next winter.
I failed to mention on the earlier post, but I do a little trick when I knit one-row button holes: I cast on one additional stitch which will then be knitted with the next stitch. I do this to prevent weak and stretched inner edge on the holes. Despite the trick, I found my buttonholes not quite sturdy at the outer edge. So, I decided to reinforce the buttonholes: using the same yarn, I applied buttonhole stitches all around. Another thing I forgot to mention: I use back buttons for support.