I decided to topstitch around the back of the neck only. The fronts are all interfaced so I don't have to worry about the seams coming unravelled. But at the back of the neck, the thin lining fabric is sewn to the loosely woven woolly fabric and I feared an early dismantling of the neck due to fabric failure. I sewed a second line of stitching beside the first but then, after I had turned the jacket right side out, I put a line of topstitching on to reinforce everything.
It fits and doesn't bind anywhere. Maybe they fixed the pattern after earlier complaints? Maybe that little side piece went missing? It is very small - a "jackette". The sleeves are 3/4 and the hem hits only a few inches below my waist. But I did only have 1.1 metres of fabric! But I like it. It's light and shouldn't make me too hot while I wave my arms about in the front of the classroom.
Now I just have to choose the button. There's only one button at the neck. Carmen suggested yesterday in the comments that she liked the largest gold button, in the lower right in this pic. I like that big button too but I am also leaning toward the shiny plastic brown button in the lower left. The big gold one is really big and almost sparkly. Maybe I should go for the smaller, duller gold one in the upper right?