Well, I know I've gained a few pounds, but ...
So, that's what I did. After making my horizontal bust dart adjustment, I cut the muslin according to the pattern sizing. And this is what I ended up with:
Clearly, this is too big. But clearly, the horizontal bust dart is doing just what I want it to do. So, I re-marked my pattern, grading from an 18 through the waist (oh, that middle aged spread!) to a 16 through the bust and 18 through the shoulders ( I have broad shoulders).
I also added an inch to the bodice length. This pattern has a very short bodice. And my results?
Better. Much Better. Now, I have no concerns about cutting out my fabric and proceeding!
All of the muslin sewing and adjustments? Took me about 30 minutes, tops.
And that, my friends, is why we make a muslin.