Runs very small - very nice and very sexy but runs small especially in the arms

Nice jacket,runs way too small. I’m a 32DDD,average shoulders,hourglass shape. To give you perspective in how all over the place FN sizing is,here’s my sizes in other jackets: Need for speed bomber:Medium,Business moves cropped blazer:Large,Take the lead cropped blazer:XL. I’ve tried this blazer in XL,it was too tight overall. The 1x and it’s tight in the arms. That’s crazy. My IG is @Jasleene_J if you want an idea of my proportions.