How can you tell if a jacket is too big without seeing the underlying body?
With RTW, I usually have to get my jackets a bit wide in the shoulders because otherwise they won't fit my hips; if that results in a too big chest it's not a problem because my tailor takes in the chest below the armpits. So I end up getting a jacket that fits rather well and with some shoulder extension, which I prefer.
Ernie, your jacket seems to have too wide shoulders but I doubt sizing down would be much of a difference in that respect. It seems to be rather unstructured so you would likely get that "droopy" shoulder look even if you size down. A size smaller could be too small in the chest/hips, which is worse than too big.
The biggest problem I see with your jacket is that it's too long, and not just in the sleeves.
Thanks for the insight. The sleeves and body are too long, shoulders are droopy as you pointed out, and the chest is way too big on him. It's not a far off guess to say it's too big. But you could be right (probably are)
Could the shoulders also be some weird padding?
Either way, I think trying down one size in that maker couldn't hurt, if it's local.