Kate Middleton
Credit: Samir Hussein/WireImage (2); Indigo/Getty

We’ve been planning Halloween costume ideas left and right, but if you’re the kind of girl who finds yourself rummaging through your closet ten minutes before your Monster Bash starts, we’ve got the perfect solution for you—go royal. Catherine, the Duchess of Cambridge is one of the easiest costumes to master just by using pieces already in your wardrobe (and a little help from your friends). Click through the gallery for some inspiration, then have fun royally rocking Halloween.