As to J Crew sizing, I don't have any problem with shoulders. Mind are slight, relatively, and I need to size up in fitted shirts anyway since I'm short-waisted and curvy. As mentioned above, it does tend to be narrow in the torso.
Most of my J Crew items are tops anyway. I have some pants, but those are very hit or miss on me, and a few jeans, skirts, sweaters and dresses. I have to rely on reviews etc to get it right.
These recent items have been winners.I do have some pants but from past season (not so focused on needing pants during the pandemic and in my current verge of moving situation--mostly wearing jeans and I have plenty).