I cut the fabric in two rectangulars. Holding it as in the picture I pinned the hips. This was the easiest of all.
The back was not so funny at all. I had to make a line along the and one in the front middle.
The result is here.
But it didn't please me.
I repinned and repinned.. I have to save another day for this work.
When I tried to turn the basted seams it was winding in the front.
I don't like making patterns, I admit that I don't know nothing about them :-(