Christian Kulas, 24, was arrested on Tuesday in connection with the Capitol riot.
Charging documents included footage showing Kulas at the Capitol wearing Burberry.
As part of his pretrial release, Kulas agreed to live at his family's $4.5 million mansion.
A 24-year-old man from the wealthy suburbs of Chicago was arrested early Tuesday on suspicion of taking part in the Capitol riot. Posts on social media had appeared to show him wearing designer clothes and following crowds into the Capitol.
Christian Kulas was charged with unlawful entry and disorderly conduct, misdemeanors punishable by up to a year in prison, WGN reported.
A charging document said the FBI had received multiple tips about Kulas.
One witness provided footage that appeared to have been taken by Kulas and posted on an Instagram account associated with him, the document said.
Videos the account posted during the riot showed a man following crowds from a pro-Trump rally to the Capitol, climbing an exterior wall, walking up the steps of the building, and walking around inside, the FBI said.
At one point, he turned the camera toward himself - he was smiling and could be seen wearing a "Keep America Great" hat and a dark coat with the Burberry print in the hood, the document said. At another point, a voice could be heard saying "storming the Capitol," it said.
The FBI interviewed a second witness who said they went to middle and high school with Kulas. The witness was "highly confident that the individual depicted in the videos wearing the Burberry coat was Kulas," the FBI said.
The witness was "also familiar with the sound of Kulas's voice" and "identified Kulas as the speaker of the words 'storming the Capitol' in the video posted by the Instagram account," the charging document said.
Kulas was arrested just before 6 a.m. on Tuesday and later appeared in court via telephone link, the Chicago Tribune reported.
CBS Chicago reported that Kulas had signed a $4,500 appearance bond to be released from custody, meaning he doesn't need to put any more money down but would owe money if he violates the conditions of his bond.
The conditions of Kulas' release include that he mostly live at his parents' home, surrender his passport, and stay away from Washington, DC, CBS Chicago reported.
WGN said public records indicated that Kulas' parents owned a mansion in Kenilworth on a bluff overlooking Lake Michigan. The home sold for $4.5 million last year, the Chicago Sun Times reported, citing the real-estate website Redfin.
Kulas' mother agreed to ensure that her son continues to comply with the court appearances, while his father said he would remove two guns from the house, WGN reported.
More than 500 people have been arrested in connection with the Capitol riot.
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