" … and no identifiable tattoos."

Also don’t wear any clothing you bought from a unique Etsy store (or any store you physically visited and paid with a card).

The clothes you wear to the protest should also be bought from a thrift store that you visited without your cellphone and paid for the clothing in cash.

Otherwise, yes, your clothing purchases are tracked, and the young lady who torched a cop car during the George Floyd protests was literally found by the FBI searching Etsy purchase records for people who had bought that shirt.

https://www.inquirer.com/news/lore-blumenthal-philly-protests-george-floyd-sentencing-20220728.html

Other options are facial recognition defeating clothing like this:

https://www.dezeen.com/2023/02/07/cap_able-facial-recognition-blocking-clothing/

Or this:

https://www.thesun.co.uk/news/2496686/anti-cctv-reflectacle-glasses-will-let-criminals-evade-the-law-and-activists-dodge-the-surveillance-state/

EDIT:

But neither of those help when we’re dealing with stuff like Gait Analysis.

For help with that, we must turn to the Ministry…

https://www.youtube.com/watch?v=iV2ViNJFZC8

Gee, people in the US need to be this cautious when protesting? Where I live it’s totally fine to just casually show up at protests, take selfies, talk to people and whatnot.