Pattern piece altered in 3 areas: Front neckline, bust, front center hemline.
I recommend using Pamela’s Patterns Perfect T for a starting point. Her pattern is made for us mature women – the shoulder is forward and sloped (I think those are the changes she uses for her basic patterns). Her techniques are basic and I’ve made a ton of these t’s with all sorts of necklines and sleeve length (including sleeveless).
For my former shape (since reduced) I added 1 inch at the neckline and center front hemline for this no-dart technique.
I will have to retrace the pattern and figure out how to fit my new shape (this is a SWAP goal). My former shape required a 1 3/4 inch spread when doing a traditional Y shape FBA. I think my new shape requires a 3/4 inch spread (not as reduced as I requested, evidently!). I had this surgery in June and I am still unable to wear a traditional b r a – I’m still wearing a sport’s b r a and will be for quite a few more months. Therefore, I’ve been told, I have a uniboob. Sigh. (Mothers!) And I’m quite self-conscious in posting photos. What is still healing are the underlying muscles – there is no way I can even wear a larger size band for 5 minutes. So I have no idea what my final size will be but I’m thinking a D cup based on my latest attempt at trying on b r a’s.
More info than you requested, but this is about making clothing to fit our unique shapes and the challenges thereof.