The same pattern and similar routing. The pattern consists from the left and right leg.
I had to make two pieces. One was no problem. I eventually start liking sewing pants:-)
The other owner-to-be gave me a piece of linen bed sheet or whatever with a seam in the center, so I had to work with two quite narrow rectangles. I decided to leave out the poined parts and insert a gore instead. This way I was able to use his fabric.
I cut these parts in the same height at the knee and both 8 centimeters from the upper middle.
I drew half a gore according to the piece from the front side and added the back side, seam line in the middle.
I sewed the gores to the front parts of the legs. The seam allowances are pressed to the sides (this should make the seam as little visible at the front of the trousers as possible).
I serged both seam allowances and sewed each leg together.
The back seam allowances will be serged together and pressed to the back.
Then I sewed the center seam. It should be sewed twice at the same place, because it's the most stressed part of the trousers.
I hemmed the length of the legs and prepared a tunnel (cut separately). It's made of two pieces, I didn't sew the whole center front seam but left a slit there for the elastic band.
I sewed a little rectangle around the hole for the allowances to lay flat.
I sewed the tunnel piece to the waistline. I pressed the allowances up and the upper edge down at the same time.
I folded this piece down to the wrong side and sewed its lower edge to the trousers. I added the elastic band and..
..this is it. I'm happy because the gore is not very noticeable. The shadow behind is the other pair (trousers No. 3 :-D).