Oh-h-h! I saw that jacket and was tempted to order it, but then had to remind myself that I rarely wear outerwear jackets and/or the leather jacket I own. And frankly, the trim would work better for you than me.
My only Bernardo experience is with a puffer vest that I ordered for both me and my daughter. I needed the PXS which is the smaller of my two sizes (not often needed), and the PS for her. She is very much IT with a broad back and shoulders and not much up front. PS will fit her if at all, and PM usually works for her shoulders and then the rest will be too big. This is the first time I've seen Bernardo leather, not that I've been looking.
If it were me, I would gulp and order two sizes because inevitably when I order one size I need the one I didn't order!!!