Make Your Own Costumes

My son came home from church with this costume (Armor of God) a few months ago.  They made each piece a different week.  From what I can tell it mostly was made of cardboard, aluminum foil, elastic, and duct tape.  The shoes are socks covered in duct tape.  He loves it!  We missed the week they made the helmet so we had to substitute our own helmet. 

What kind of costumes have you made?