"I am female, these are tips to make you appear stronger as a female on the street (walking home, nighttime subway, etc):
If you think you are being followed or if you hear somebody behind you - feel free to turn around and look directly at them because it shows you are not afraid to be aware of your surroundings.
By the same measure, don't be afraid (generally) to meet people's eyes. Not in a confrontational "yeah? WHAT!?" sort of way, but in a "I am seeing the people in my world" sort of engaged and aware way.
This shows you do not fear engaging your surroundings.
Again - this is to show you are capable, this is not to provoke or antagonize - that's a different, defensive posture."
Switzerland?
Most of Europe except some corners in Frankfurt, London or Paris.
Life is easy if your brain only works in black and white!