This adorable little devil hat knitting pattern is perfect for Halloween and makes a great quick and easy costume for anyone from baby to adult! Are you ready to add a touch of devilish fun to your fall knitting? I decided to really get in the spirit this year and design a little devil hat knitting pattern! This spooky but easy hat knitting pattern is perfect for bringing out your inner mischief-maker and makes a great base for an easy DIY Halloween costume.