Disguise Men's The Simpsons - Duffman Classic Muscle Adult Costume The Simpsons Duffman costume includes a jumpsuit, cape, beer holder belt and duff beer hat. This Duffman Classic Muscle comes in adult sizes X-Large, XX-Large. This outrageous Duffman costume features muscles built in to the chest and torso. This Duffman Classic Muscle is an officially licensed The Simpsons costume. The sunglasses are not included with this Duffman costume for men.