From The Truth About Guns:

Illinois Governor J.B. Pritzker issued an executive order last week requiring residents to wear masks in public effective May 1st. However, the order puts gun owners in jeopardy with Illinois firearms laws.

Sec. 24-1. Unlawful use of weapons.
(a) A person commits the offense of unlawful use of weapons when he knowingly:
(9) Carries or possesses in a vehicle or on or about his or her person any pistol, revolver, stun gun or taser or firearm or ballistic knife, when he or she is hooded, robed or masked in such manner as to conceal his or her identity;  [Emphasis added]