Step 6: Sew in third sleeve
Use a seam ripper to open the seam directly below the existing arm hole in your final outfit, extending the hole just far enough to fit your third sleeve inside. Adjust the new sleeve position so it matches the original sleeves, then turn the outfit inside-out to pin the sleeve in place, right-sides together.
Sew sleeve in place, stitching right inside the edge of the split seam. (you'll likely have extra bits of cut sleeve protruding beyond, which is fine.)
Turn the outfit right-side out to admire/check your work.
Now you can sew your third arm into the sleeve, anchoring it at the shoulder only for extra-lifelike flop. Alternatively, go put the suit on your 3-armed baby.
Sew sleeve in place, stitching right inside the edge of the split seam. (you'll likely have extra bits of cut sleeve protruding beyond, which is fine.)
Turn the outfit right-side out to admire/check your work.
Now you can sew your third arm into the sleeve, anchoring it at the shoulder only for extra-lifelike flop. Alternatively, go put the suit on your 3-armed baby.
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