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Bodysuit pattern was free.
First off, can I just say that new babies are hard to take pictures of? They don't make very good models. For one thing, they are too wiggly. Every time you get something positioned the way you want it, those little arms and legs get going and mess it all up. And for another thing, they can't stand. So everything gets all scrunched up.
So here is a picture of the subject of this post, sans the baby it was made for.
And here it is on the adorable baby. I love the idea of a baby as a mermaid. Since they can't walk, you can just make the tail. I made mine from minky to give it some texture, but you could really use just about any fabric.
I used this seashell stencil to cut seashells out of felt, then just appliqued them to a body suit.
I also cut a starfish shape out of felt and blanket stitched around the edges. Then I glued it to an elastic and she has a cute starfish to wear in her hair.
I also have a tutorial and a free pattern for the mermaid tail. It's just hand drawn, so it probably won't line up exactly, but it's a mermaid tail, not legs, so it should be pretty forgiving. It's also pretty roomy on my baby, who is a 0-3 months size, so I'm pretty sure this will work for a baby up to six months.
You will need:
mermaid tail pattern
about 1/2 yard of fabric
Using the pattern, cut out two tail pieces on the fold.
Open them up and sew right sides together all the way around. Leave the top (flat) edge open.
Clip corners and curves.
Turn right side out and poke out your tail so that it lays flat.
Cut a piece of elastic to fit baby's waist and sew into a loop. I used a pair of pants as a guide.
Mark your elastic with pins in quarters.
Line it up with the top of the tail. The elastic should be on the inside, with the top edge of the elastic lined up with the raw edge of the tail.
Zig zag stitch the elastic to the tail, stretching the elastic evenly around the top of the tail.
Fold the top of the tail over to form a casing for the elastic. Stretch the elastic, and zig zag stitch all the way around to close.
And there's the tail. Slip it on baby and you've got a cute and simple Halloween costume.