I have revised this post following some comments from Seth, who refers to the back as ‘belted’ and the breast pocket as ‘box’; and Primrodo who has helped with some pocket detail.
There are several key design points I wanted to achieve with my suit.
LAPELS & COLLAR
The lapels and collar are set quite high. The way the pinstripes sit on them give some clues as to their shape, but conversely, also limit how it can be cut without them hitting right, so I will have to be careful.
The breast box pocket is a fairly easy design to follow; the outer pockets have a peculiar quirk to them that will need some further research to get right. The pocket flap is attached to the lower welt, not he upper, hence access to the pocket is ABOVE the flap, not under it as with conventional suit pockets. But then, this is no conventional suit!
The belted back needs to be at the right position, just above the back vent. This will make sewing it on a little challenging, but I'm sure I will work it out.
I will make these to a fairly standard pattern I have bought - only thing is, I have never made trousers before, so that will be fun!
To arrive at a decent pattern, I have, like I did with my coat, sacraficed my old Honest Dragon suit in the name of tailoring, and have taken it apart to see how it was made (with a pinch of salt) and use it as a spring board for my pattern.