I find that any jacket that is "sized" rather than S/M/L etc is always narrow on the armholes. Helene Berman is another one although her jackets are quality, but equally come up small. Designers never seem to take into account that ladies upper arms get bigger as we age, so they create a ''Dolman' sleeve - big deal.
You're right Merry, the denim/biker/ jackets are rarely worn done up, and I did have a friend who was 'beefy' up top and always wore jackets that were too small for her. Could never understand it. If I'm out and it gets a bit parky in the better weather, then I want to do a jacket up !