This costume is simple and UTTERLY MONSTROUS. How do you become swamp thing? It's easy.
1) Put on the ghillie suit.
2) Put some camo color on from the provided compact.
3) Plop yourself down in the nearest swamp*.
4) Emerge, and bring moist, sticky terror to the populace.
It's just that easy. Don't let anyone tell you Halloween is hard!
* Swamp not included.