Now that's one I haven't heard before! A foolproof disguise!
Nope, actually, there are more bounty hunters out there, and they have a bead on you that not even the best disguise could throw off: You've got a big red sign on your head that reads "I am the protagonist, the Player-Character. Please kill me."
And you thought your hike through the Sword Coast would be so peaceful, too. Those crickets were peaceful, weren't they? Why can't we just have woodland streams and crickets?