To correct this, we started from the center front, top edge and worked out and downwards. Mom pinned in a little both above and below the bust, allowing the fabric to conform around the vertical curve of the bust instead of just flaring out; this was paired with a very minor correction at the center front. A small intake at the second seam was used at the top, again to help the fabric conform to the bust. There is now some creasing under the bust, but that will self-correct when boning is applied; if not, we'll have another chance to make changes, as I plan to make a second fitting mockup.
|The corrected bustline|
|the back, with the side seams opened|
|A the gap between seams|
|The space is filled with scrap fabric|
|The gore, pinned and marked|
|The mockup after corrections|
The next step is to examine the mockup and draw another copy of the pattern with the changes added. In this case, we are adding a whole new piece with the gore. This too will get sewn up, and it will get boning. For the final corset, I do intend to order steel busks and boning, but not for a mockup - for that I will use one of several types of boning that I happen to have around the house. (Most people don't have three or four different types of boning just lying around, but I do!) Additionally, I will use ticking-stripe canvas and construct so that the mockup could be used to build a garment should my little heart desire.
This is the result of one weeks' time. I only have nine more weeks! That sounds like ages, I know, but it's not.