To me it seems like they're proud of both their Dutch citizenship and Turkish heritage. Like yesterday in America during St. Patrick day parade in NYC where you'll see American flags as well as shamrocks and Irish flags. As an aside, I grew up in The Bronx, a borough of NYC. It was named after Jonas Bronck who lived their hundreds of years ago, a Dutchman. When people wanted to visit them, they would say, "Let's go up to the Bronck's" meaning their home. So not only the name stayed, but the The also. No one around here says The Brooklyn or The New York, but everyone says The Bronx. Of course New York was originally New Stuyvesant until your friends the English stopped by and decided to rename it. when I was a kid we used to play stoopball. I'll let you figure out what that was.
Anyway, maybe the white "scarf" represents the veil a Muslim woman wears for pre-marital modesty that is removed because she's with her husband now in the car and isn't required in front of him. Just a guess.