Looking through the pictures I was thinking, there's parts of the world where people just dress that way.

I feel like if the facial recognition systems are that good, it means if I can recognize a face, then so can it

I don't think that's true. I'm no expert on facial recognition, but I believe those systems look at more specific details, like the corners of your eyes and mouth, and where they are relative to your jawline. They're less interested in things like "could this be part of a cheek? does that hair cover a head? does the picture as a whole make sense?". They're very precise (more than we are) at measuring the exact locations of specific features, but less good at checking if the picture as a whole could be hiding a person.

So they're better than us at some things, but can still fail dramatically at things that seem trivial to us.