A New York man pleaded guilty Wednesday to felony charges related to the Jan. 6, 2021, Capitol riot more than a year after he dressed up like a caveman and joined the mob that stormed the building, prosecutors say.

Aaron Mostofsky, 35, had been charged with a felony and misdemeanors for his part in the riot: stealing a U.S. Capitol Police officer’s bulletproof vest and wearing it while he was in the building, where he also picked up an abandoned police shield, according to the Justice Department.