Years ago Ruth sent me a draft of her space suit wings. I finally got around to getting them uploaded and digitized on my computer. I recommend making a test pair out of paper or something so you can adjust the size accordingly.
As for materials and maintaining the stiff wing shape, I leave that up to you to explore. Some people have used 1/2" sheets of upholstery foam with wire on the edges to shape. I've tried stiff interfacings and milliner's buckram with mixed results (once they get dented or bent they don't recover). I've even made 'disposable' wings with black garbage bags and cardboard and 1/8" craft foam, and just replaced them after several uses.
A 5/8" seam allowance has already been added to both sides of the pattern. All you need to do is place the top end on the fold of your materials. Basically, your wings will look like a boomerang when laying flat.
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| Click to download full size (22" x 35") |