The second ribbon has been sewn along the busk.
They blend in nicely. I'm quite happy with this solution. Then the boning was slipped in.
I cut the bones to leave 1/4 inch at the top and bottom of each channel, but it's tighter than that. Here a pin marks the end of the boning.
Including seam allowances there are four layers of fabric at each end, but since it's just ribbon fused with batiste it's not that heavy. I feel like flossing is important to prevent poke through. I was going to go with the top design from this sampler.
But I'm thinking of changing the color to the same fuschia as the ribbon because the orange needs a bit more space visually. More than is on the sample. At least I think so. Your 2¢?