Here I tried to draw what a proper seam allowance of sleeve cap should look like in my opinion. Basically, it should go at 90° angle from where the top “intersection” notch is
Any idea how to make it happen in Seamly? How do you make seam allowance of this part?
I’m considering some “post-production” in Inkscape or maybe other graphics editor but still very little idea about how to make it in the most efficient way