Got this idea for a frosted Mini-Wheat costume for child from this very site, but did my own spin on a few touches.
I used foam for the costume, covered it in brown felt, then painstakingly hot glued oodles of raffia on the front and back of the foam/felt. I then used white spray paint to give it the “frosted” look and finally cut out the eyes and grin with black felt and hot glued to the raffia. I glued the front of a box of Frosted Mini-Wheat’s to an orange paper gift bag and my son used that as his candy bag. I also glued an empty milk carton to a ball cap with some really thick looking white pipe cleaner coming out of the spout to look like milk was pouring out of the milk carton.