This is how I know that I have a long, long, long way to go before I will be able to sew well-fitting trousers for myself.
It's a test garment made from a polyester twill, using one of the Simplicity Perfect Fit patterns. According to their instructions and my measurements I used their curvy fit. But as you can see I have a flat (and possibly droopy) bum and probably should have used the slim fit version (maybe).
All I can say is, I'm glad I don't have as much trouble finding jeans that fit me well...