Costume stores and Web sites are stocking plenty of fairy costumes in various colors and styles. Prefer to whip up your own? Wear tights, a body suit (or leotard), and a flirty, filmy skirt. On your feet, wear ballet slippers (pink, black, or white, depending on your color scheme) and on your head, wear a sparkly headband, tiara, or a garland of flowers.
Create your own magic wand by wrapping a wooden dowel in ribbon and hot-gluing it in place. Add a few ribbon streamers coming from the top. The finishing touch: A pair of fluttering wings. Now you're ready to go make magic!