It's not the sleeve length, it's the dropped shoulders - on everything. The MMM jacket also looks too big, and so has pretty much every piece of outerwear I can remember you posting (feel free to correct me). Having both shoulder and sleeve too big makes me think "Just size down," but maybe I am being optimistic.
I have only two pieces of outerwear right now - that denim jacket and this:
which fits fine everywhere. I wouldn't mind replacing the mmm jacket at some point, because you're right, essentially, but I haven't found anything I liked more and I don't want to buy something out of desperation. I'll probably end up with a toj cwu-45 in black. I think I might give the impression that I have more badly-fitting stuff than I do because I've posted things in should I / shouldn't I and then not kept them?
I also tapered those white jeans last night, so I mean, I do follow tailoring advice from you guys a lot of the time.