About 8 years ago, I went as a s***head. Would never think about doing it now, but I was 21 at the time
I took a construction-type hard hat, put it atop a small construction cone on top of a box. I then sprayed a full can of expanding foam, starting wide around the bottom, around and around, to make a conical poop-type shape. Then painted a dull brown and mounted some of those big plastic "texas flies" on it. Cut the bottom so it fit right against my shoulders, used paddle bits for eye holes, paint touch up - voila. I wore nice clothes and won the contest. I even got my girlfried - now my wife - to wear one, lol. It still suprises me to this day that she wore it.
The hard hat was a stroke of genius, it supported the wight like a champ - adjusted to fit tightly, yet still allowed room so we didn't burn up. I had pics somewhere, but in three moves, a marriage and two kids, they're gone