Section 1363 of title 18, United States Code, is amended by adding at the end the following: “Whoever, during the commission of an offense under this section, wears a disguise, including a mask, shall, in addition to any term of imprisonment otherwise imposed under this section, be imprisoned for 2 years.”.
Man, cosplayers are gonna be pissed.
Really though, this sounds almost silly considering how broadly it is formulated. Hell, you could count Halloween costumes as a 'disguise'.