For the moment, just draw the holes. Make them later
Left top, right: bottom.
On the upper piece, holes are draw, while on the bottom one, they are done.
Top and bottom with the holes.
NB: the gusset is not dyed on the photograph. It was a test to check if the length was okay.
There are some torsion so you can see the gusset depending on the view angle.
View of the inside.
This second time, I stitched the finished gusset, with dyed leather.
Start burning the threads.