A ninja is one of the easiest outfits out there. Just tie a black scarf around your forehead and make a few ninja stars to throw around. Origami ninja stars are really easy to make, find the instructions here. Once you're dressed, sneak around and fight crime, ninja style.
To be a super hero, all you really need is a cape and a belt. To make a quick and dirty cape, fold the dress just below the waist and pin it to your shoulders using safety pins with the top of the dress on the inside and the skirt of the dress on the outside.
In this post: Shoes - Piperlime, Dress - Old Navy
