Jim,
From the photos, its only the fabric that is messing the fit up a bit, once you are out of the mock up and working with a decent fabric for trousers/slacks you will find that the fit will be a lot better as it will "fall" better and be a lot less prone to wrinkling. One factor is its almost impossible for a person to stand exactly straight for a photo, slight posture changes, uneven floors etc ....
I will be interested to see that finished garment if your better half does not mind doing the modelling.