To continue with my coat adventure, I thought I would step back a little and look more closely into the pattern development.
I usually draft for men, and the process is direct as in I draft a shirt, or a waistcoat or a jacket from scratch. Tailoring doesn't start with a basic block, but women's wear does; a basic block is drafted and all the subsequent patterns are derived from the basic block.
So, one needs a basic block to start with.
I have seen many instances online of people developing a skin tight block, they take courses on how to do it, but I have noticed that many people struggle through that process only to find that they don't know what to do with it once it is done. I guess it is good if you want to create a judy for your particular shape, or create a very fitted shell to squeeze a foam judy into. Having a judy of your size and shape can be a real asset especially if you are not a standard shape or size, but it seems a challenging starting point for most people.
I think the better choice is a block pattern that is fitted but still has wearing ease in it.
I have a block that I drafted using on older (late1960's) version of the Muller et Sohn method. Technically, it was a draft for a jacket but I think it gives me a lot of flexibility to make a closer fit as well as a looser fit depending on what I want to make from it.
It has 4.5 cm of ease on the half pattern, so 9 cm total ease around the bust. To compare, the Natalie Bray block (circa 1950's) drafts with 5 cm of ease on the half bust (or hips if the hips are bigger).
I like the Muller version, it gives a lot of flexibility in that it divides the body up into sections back, armhole and front. The sections of the body have proportional formulas to which you add ease. I think it gave me a good idea as to whether my personal measurements fit within the proportional parameters to start with.
The other aspect that I like is that as the bust circumference increases, the proportions change to reflect that. In other words there are size break proportional changes.
Here is the basic chart. the english translation caption I believe should read: back width, scye width and chest width.