You've accounted for much less than 50% of the odds of where the jacket was made.If I was making a book on the country of original it would go something like this
12-1 New Zealand
150-1 Elsewhere in Europe
B-Man2 is spot on. The hat and lack of collar insignia is important. This photo was not taken in some wartime situation where there would be a reason to conceal one's rank.Hi
The only thing I would bring to your attention is that if he were a Commander the brim of his hat would have gold braid. The link you posted makes that very clear . This guys hat has no braid which once again according to your link makes him somewhere between an Ensign and a Lieutenant Commander. Just pointing this out as your post was attempting to eliminate inaccuracies and narrow down possibilities.
What the Ad does show is Australian styling of the era, think how many US made immediate post WW2 4 pocket "Bomber" jackets there were by dozens of makers yet all closely resembling each other.If you enlarge the photo there appears to be seam for a cuff on left arm, it may be a crease but it looks pretty uniform and straight, I'm not saying that the jacket in the ad is the same jacket but it also has a waistband and the illustrator may well have left the snaps at the bottom off the drawing.