A devil costume is a classic for Halloween.
There are multiple variations, but most devil costumes involve a red body-suit or tight clothing, horns, a tail, and often a trident. Red face paint and gloves are also helpful. Some devil costumes also incorporate a red cape or fire imagery.
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A devil in the middle.
A little devil.
.png "31 Days of Halloween Costumes (Day 3 - Devil).png (83 KB)")