Step 1: Choose some fabric & tulle fabric. You won't even need 1/2 a yard of each for this project.
Step 2: Using this http://www.hollybrookejones.com/fairywingspattern.pdf
pattern (PDF file download), cut out one wing.
Step 3: pin wing to 2 layers of tulle fabric, then sew a zig-zag stitch around the edge.
Step 4: Cut about 1 inch around the tulle following the shape of the wings. I found it's easier to cut the tulle wings out after its been sewn, then before. I had a hard time keeping it lined up evenly when I tried cutting the tulle fabric out before sewing.
Step 5: Pinch the wings in the center & pin.
Step 6: Align the pinched wings to the center top of a t-shirt or tank top. Hand sew the center of the wings to the shirt, along with a few stitches at the top of each side of the wings to hold them in place.
Step 7: Add a flower, heart, or embellishment to the center of the wings. If you don't like the flower Idea, you can just use a rectangle piece of fabric, as shown in the sample below.
I think it would be fun to make some bumble bee wings on a yellow & black striped shirt, or use some red & black polk-a-dot fabric to make some lady bug wings. Be creative! My kids LOVE their winged shirts. For best results, hand wash.
Step 8: Add a matching embellishment to the front, if you like.