After one more fitting of the 1925 corselet to fine tune the gores I'm finally ready to move forward. Before I start cutting the fabric I have to figure out what type of seams to I'll be using so I can allot the right amount of seam allowance. I've never seen an actual foundation garment from this era, but I'm thinking a flat felled seam, which I've never used, is the right one for the job. Also, the pattern shows three bones running horizontally across the waist area. I can't figure out what purpose these serve. It makes sense that vertical boning is needed to hold the fabric in place so it doesn't collapse downwards, or ride up, so it maintains it's shape. But horizontal boning? Does the fabric need to be held so it doesn't squeeze inward at the belly? It doesn't seem to be doing that in any of the mock-ups. There must be some reason. It's not for me to start declaring designated materials unnecessary, so I'll put a panel behind the silk for the bones. Spirals seem like the way to go, but again, I'm guessing.