For my wife's Batgirl costume.  The boot on the right was built red and black.  The pattern looked good enough that we wanted Batgirl's boots to have a matching patch of purple.  I made a template from the red boots and used an airbrush to put a pearlescent metallic purple finish on top of the black patent leather.  No, it doesn't match any canonical Batgirl costumes, but we're not cosplay purists, more impressionists than documentarians.  For flexible paint, I use Clear Plasti-Dip, which is... Batgirl Cosplay, Batgirl Costume, Purple I, Red Boots, Synthetic Rubber, Batgirl, Cosplay Ideas, Black Patent Leather, Red And Black