What to wear: A Child of the Forest costume is going to be a little difficult to execute, but with enough time and planning, you can totally make it work. Our advice would be to get a green mesh dress, and then hit up your local craft store and buy a ton of fake vines, leaves, and moss in shades of dark green and brown to cover as much as your costume as you can. Wrap the vines around your arms and legs, and use any leftovers to create a headpiece.
How to act: Be very crafty, and one with nature. If anyone steps on a crunchy fallen leaf, shoot them some North West-worthy side-eye.