I remember when I did that on my first predator costume, they looked good, but they were kinda heavy on the head. Now if they made light weight foam hoses, I would be all over that.
i tried this in the past, not only are they heavy but there is no sway at all, the stuff is stiff as hell, but if you are on a really tight budget then they work ok, i bent soooo many needles sewing mine and in the end gave up and bought some of booies, there really is nothing better