(Super heroes look noble and serious.)
I looked at a bunch on the internet and really didn't find just what I was looking for, the pattern at pukingpastilles was by far the cutest I thought and I just modified it a bit. My pattern looks just like the light pink fabric. I iron my fabric in half pin my paper pattern to it and cut 1 patterned piece and 1 solid piece, pin those together, then sew it all around leaving a little opening at the bottom to pull it through. After that I simply iron it and hand-sew up the opening - that's it! I do usually iron on a felt patch with their first initial and sometimes if I am feeling really crafty I sew the patch on. Also I started making them with Velcro at the neck which seems super important to preschoolers who can't tie them on yet or untie a double knot and some kids will not wear anything around their neck that they can't take off independently.
Oh and I almost forgot to say - they give you the ability to fly :)
If anyone wants the measurements of my pattern and fabric pieces just leave it in the comments and I will update. But mine are really similar to the one at pukingpastilles. I think making your own pattern from things of the web is very easy if you print out the basic shape and have the measurements. One reader mentioned to me that they cut capes out of t-shirts and that is really brilliant because since jersey doesn't fray so they would be no-sew.
Happy Crafting and Saving the World from Evil