I would consider taking a class in just FITTING/ALTERING a basic jacket that could then be made "fancy". I would do more than consider - I would take that class!
It would probably need to involve muslin and a very limited class.
I'm not talking a blazer type jacket -
I have a very ample bust and a very ample hip/backside - I actually look rather like those cartoon old ladies with the big rump and droopy boobs - and narrow shoulders - and I'm short.
and I would love to get a very simple jacket to hang as well as it could on me.
There are two kinds of "big" women - those with the large frames and those of us that are "padded" - our shoulders don't seem to get as wide as the rest of us does!