Starched a piece of artist canvas till it was good and stiff. (puns were flying everywhere) Then pinned it to his head and sewed a seam.
Rolled up batting to fill the canvas tube. Looks more like a conehead from SNL.
Covered the cone with bright blue fleece.
Put a drawstring on top to make the top rounded.
Added 'snakes' of batting to make it more bumpy.
Cut scallops around the face and added an elastic chin strap. He/she has to run in this get-up!
Made a sleeve at the top of the dress fabric for elastic and sewed in boobies. Less chance of losing them, if they're attached!