For my State. Poll Workers are required to ask prospective voters to remove the article of clothing. Whether it’s a shirt, hat etc. If you refuse to. Provided you haven’t gotten physically or verbally belligerent/aggressive. That’s the end of the situation and the extent of actions they are trained to take. You won’t be prevented from Voting.

About the only thing they draw the line at. And will get Local Law Enforcement and Elections Officials involved with. Is people setting up signs, or people from standing around and actively Electioneering and badgering voters in line in favor of one Candidate, ballot measure or amendment within the 100 foot perimeter