These wings are
intentionally soft and floppy, but that also means you might want just a
little bit of extra security with keeping them on and not flopping all
over the place.
Sew a small tackdown seam in matching thread, about an inch or so
away from the edge of the wing. Try to sew it in the same place as one
of your stitched lines already to keep it hidden. Do this on both wings.
Now your wings will still flap around, but not quire so much that
they’ll be annoying.