The hat but also scarfs. It is so true about 'medics'. In the Kenosha riot, we saw several fake medics caught out carrying paint spray cans.

There is however more in this. An analyst identified that the Antifa contingent consists of a hierarchy. Antifa has a semi-military command structure for riot protests.

The street agents are the hat guys, but they are directed by a higher level 'captain' with a radio (not just a phone!) using encrypted communications, and the captain(s) are given strategic directives from a supervisor generally sitting in a parked command vehicle in the area. That person does the coordination of efforts, at a high level. My guess is these have maps and are sitting in either a windowless van or an SUV with darkened windows. And probably have police scanners.

Do not be fooled by their being anarchistic - they are well organized. I think it will be needed in 2021 for us to have counter-agents with the duty to specifically identify likely Antifa agents at protests and deal with them, at least by shadowing and catching them in the act maybe with a covert camera crew. But beware - some of the green laser police blinders have been Antifa. I have no doubt they could escalate if followed around.