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The front band isn't just inserted into the seam like trim, it is sew to the front before the yoke (and trim) are sewn on. Also, for the front facing I cut the center and inner front, but the top facing (pattern is included) only extends to the edge of the inner front.
But, I did decide to do the topstitching. It looked too boring without it.
I know that it looks tight in the hips and I will let it out, but my hips are simply too big. The back needs support in the form of padding as well as the hips let out. Another thing that sucks about topstitching is that the seams are set once you stitch them.