This is exactly the way that all "underground" operatives behave: Baader-Meinhof, FFI and Maquis, the Polish resistance, and so on.
Fade into the crowd, and you stand a much better chance of never being caught.
The head of the French Resistance (FFI) in Paris survived the entire German occupation without ever being caught. And this was even after he had escaped from a German prisoner-of-war camp!
How did he do it? He looked "ordinary."