We got an over sized button up shirt from Goodwill, flower foam for the neck piece, silicone putty for the meat look, corrugated tubing for the blood veins and arteries, empty pretzel jar with the back cut out, and breathing holes drill in front of his mouth, and fake blood.

This head in a jar costume was a HIT, went to several trunk or treats at local churches and EVERYONE stopped us to take a picture!