I think, i'm not going further with this idea (i made it just for fun), but i'll share it: I attached an old computer fan (12V 7x7cm) with a 9V battery to an asian conical hat (with distancer), airflow facing upwards. It does (more or less) what i intended - it moves a little bit of air at the upper body, not much directly at the face.
But my fan isn't powerful enough (i notice the airflow just with no clothing at the upper body) and there is some kind of net necessary that stops hair from getting stuck in the fan.
Maybe a more spherical shape would work better because it directs the air more to the body.
With a 5V fan it could be used with a powerbank and USB cable, but i am concerned about performance with such a configuration.
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