Here's why:
* It's mysterious and intriguing: Just like a good costume, it sparks curiosity and leaves people wanting to know more.
* It's versatile: I could wear all black, use camouflage, or even go for a more ethereal look with flowing fabric.
* It allows for creative movement: I could move silently, use shadows to my advantage, or even incorporate some ninja-like techniques.
What about you? What adverb would you dress up as?