I made this homemade raindrop costume for my daughter when she was 4 years old. I started with two large pieces of foam that I found at the fabric store. We were lucky enough to find this great shimmery blue fabric that was just perfect for the water effect.
I cut out a raindrop shape for the back, using two pieces of fabric, sewed those together and turned. I then cut one of the foam pieces and stuffed it into this “pocket”. I did the same thing for the front piece, except this time I cut holes for the face and arms. Again, I cut the foam to match the shape, cutting a hole for the face and arms. I had to hand stitch the face hole closed around the foam. I then hand stitched the front and back pieces together all around the shape, leaving a space open around the arms and also the bottom.
This is really adorable, and the fabric is perfect!