My friend Robin got me thinking with her thoughtful comment to my last post.
Obviously what I am providing here are some first principles for flat pattern alteration to help new and returning sewers get started, and to help them understand why patterns are not fitting exactly right straight out of the envelope.
For real fine-tuning once you understand the basics, or to establish a good fitting basic garment you can use to overlay commercial patterns, or even as a basis for your own designs ideas, a sloper - a custom fit garment is a great idea.
You can learn how to draft these, Craftsy has good courses and Robin is a grad of many of them, or develop them through your own trial, error, and efforts.
Full disclosure here, I am not myself a person with a lot of time (humane wildlife removal going on here all week plus I am committed to helping my middle guy paint his new B and B) or more to the point a lot of patience for those processes. I am more a sit and sew when I have a few minutes kind of girl these days.
So all of this made me perk up with interest when I saw Bootstrap Fashions has introduced some new dress slopers for wovens and knits.
I was delighted to see the fit specs included things like belly protrudence, posture and shoulder slope which indicates to me that these patterns, very reasonably priced too, might be very helpful in automatically sorting out some common fitting issues.
I haven't tried these patterns myself, but they are moving to the top of the to-do-list, and I would be most interested in anyone else's experiences.