The top edge was finished with bias tape dyed to match the warm grey thread. I pressed it first so the front edge of the bias tape was 1/8 shorter than the back edge, that way when I sewed I was sure the back would be stitched down. Then I just folded the trim over the top edge of the corset and sewed it from the front. I went with exposed stitching because I felt it looked right with the stitching on the bone casings.
The trickiest thing was tucking the corners in at the low center "V" point. I was struggling with folding the end in until I thought, "What would Robert Lang do?" I decided he would not try to stretch or jam the bias tape into any position, he would gracefully fold it in on itself until it was flat. So that's what I did. So that I may do it again I drew a diagram.
The views are all from the interior of the garment, so wrong side up.