This where you can find the original text and my question pertains to sections of text found in pages 11-13 and the diagram in page 15.
So, I've been trying to make me a pair of fishtail back trousers and, through this sub, came across this text. The instructions for making the front panels (topsides, as the guide calls it) are very clear and I was able to draft a pattern to my measurements, no problem.
My issue has been with drafting the back panels (undersides), well, there have been a couple, but the big one is this: he tells us to make a line from point 21 to 22 then, pivot the line from point 22 until it reaches 23 then, project a line from 23, through 22, into 24 and THAT line (23-24) should measure "the half seat measure plus 2 inches".
Here is what confused me: he doesn't tell you how to find points 21; 22 and 23 (in Dia. 1 and Dia. 9 the 21-22 line seems to be measured at different heights) and 23-24 can't possibly be half the seat measure (+2 inches) because half the seat measure would be the entire width of your backside, both panels! How do I find points 21; 22 and 23 and what should be the length of line 23-24?
Is this a typo or am I missing something? Are these points (21; 22; 23) something so obvious he'd expect you to understand without explaining? Does "the half seat measure" mean something else?