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I used Baroque Satin and silver lamé fabric. The collar has an inner layer of fusible Pellon 71F Peltex. I bag lined the entire cape - which means I sewed the sides and bottom with right sides together like a pillow case before attaching the collar. The hem is completely closed in.
My preference is to not put a closure on the front, but if you're wearing it outside the show you can easily add a large hook and loop or tie strings.