jaytkay: Mask said Cosmo has a friendly rivalry with Ripken the bat dog

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I used to make bat (or dragon) wings like that with a wire frame inside.

But when making really large ones, or ones for kids, I prefer to sew a pocket in there, then stuff it with polyester fill, so it's relatively firm, but less likely to poke someone's eye out.  I might leave wire in the section that's closest to the body, and the part that's the fingers that trail backwards (which don't always need it, or you can use polyester boning), but the outermost sections are never something that might poke out someone's eye when you turn quickly.