Here is the how to of Posaunes post:
Take your muslin apart.
Find the line S-S2 on your muslin.
On this line mark a 0,5cm distance at S and another one at S2.
Find the waistline on your muslin.
On this line mark a 0,5cm distance at b1 and another one at B1.
Take your paper pattern and put it on your muslin, point S and point b1 matching the new marks.
Using you paper pattern as a template redraw the sideseam from S upwards to the waistline. The new line should be parallel to the old one but 0,5mm apart.
Redraw the fly seam in the same manner, 0,5cm apart from the old.
Now mark another 0,5cm on the muslin at the new S2.
Now put the paper pattern on the muslin, matching K2 and the new mark. Redraw the inseam from K2 to S2 using the paper pattern as a template.
Also redraw the outer seam from K1 to S, using the paper pattern as template.
Thatīs it. Resew the muslin and try it on.
I am so confused, why sew another muslin? Can't I simply adjust the pattern in the same way since you and posaune agree the fit is correct?
On the pattern, not understanding how S and S2 move, are you saying move out each 0,5cm to lengthen the line 1cm?
So also lengthen b1 to b2 by 1cm also?
So take an additional 1cm each at the dart? The 2cm of fabric has to go somewhere and rather not take it up in the waistband seam.
Seems this all is for the front and doesn't answer the question which I had: how to take the fishform dart out of the rear?
My thought is to split the pattern and tape back together, though rather spend another couple weeks going through the process rather than to waste wool fabric.
Again, know really appreciate all the help, went from lousy to amazing, to really amazing feel.

Oh and here is the image which didn't post:

Color not showing quite right, more grey.