Many times I was sitting in a train, watching closely nearby people.
If the vehicle changes it's movement rapidly (brakes, turns, etc), then obviously, people feel the inertial pseudo-force that might even make them fall. They don't fall, however, since by the power of their muscles they keep their bodies still, and the friction keeps them in place.
All of the above, however, can't affect the movement of one's hair or clothing. I mean - this inertial pseudo-force affects both one's head and hair, doesn't it? Let's assume one is sitting in a train that brakes forcibly, and they're looking in the direction of the movement of the vehicle. They have muscles in their neck, and so they can stop their head from moving and ramming the backrest of a seat ahead; but, they don't have any muscles in their hair! So, if they forcibly make their heads still, their hair should move forward with respect to the head, just as if under the effect of the wind, shouldn't it? (with the wind imitating the inertial force) Same applies to clothing, etc.
I've been watching very closely - no such thing happens. Why...? I've been wondering for some time, and I can't come to an answer.