Just fyi, in G*rmany it’s neither illegal to show a Palestinian flag nor is criminalized to wear Palestinian clothing (whatever that is).
However, recently public protest has been made the police’s business to regulate - making left wing protest quite dangerous and edging the country closer towards a police state. The pigs made it a constraint not to show Hamas/Al Qaeda/Islamic Jihad flags on protests and due to their political/justical illiteracy they might have extended this to Palestinian flags. This is probably where Don Salmon’s error might originate.
The way a lot of this stuff is regulated isn’t through a law that literally says “you will go to jail for this.” Instead it functions through a web of social control. People can lose their jobs, their ability to rent or take loans, be harassed in the streets, all for going to a protest and waving a Palestinian flag. It might not technically be “illegal” but the law isn’t the only way the capitalist class controls society. There is a lot of “shaming” that goes on as well.
In China, you can even wear the Israeli flag to the streets, at least the police won’t care about you.
It’s a criminal offense in Germany to wear Palestinian clothing
I’m just an innocent Chilean culture enjoyer supporting my (adopted) local football club from Santiago