Quinn's costume, so I told her we could do it if we split the work: I would sew the basic outfit in white, and she would paint it.
We started with our standard fleece jumpsuit (which at this point I'm pretty fast at).
We picked up some spray paint, and the night before Trick-or-Treat (which is always on a Saturday night here) Aden worked on laying down some color. She had to keep spray painting the next morning to cover everything, but luckily it dried before the evening. Aden also added a head piece and some eyes made of foam.