We have seen a few other El-Aurians, most prominently [Soran][1]: ![Soran doesn't wear a hat][2] Also, we have seen another male El-Aurian: [Martus Mazur][3]. ![Martus Mazur without hat][4] Also from *Generations*, when we meet the lovely Mr. Soran, we also see [a lot of Guinan's people in one of their space stations](http://en.memory-alpha.org/wiki/Unnamed_El-Aurians). Female El-Aurians sometimes wear hats: ![Unnamed El-Aurian with hat][5] And sometimes do not: ![Unnamed El-Aurian without hat][6] And the hat of the first one is quite different from Guinan's. Since Guinan seems to wear civilian clothing (not a starfleet uniform), it stands to reason the hats are just her personal taste. [1]: http://en.memory-alpha.org/wiki/Tolian_Soran [2]: https://i.sstatic.net/gTyfRm.jpg [3]: http://en.memory-alpha.org/wiki/Martus_Mazur [4]: https://i.sstatic.net/ebU0Rm.jpg [5]: https://i.sstatic.net/BwGY4.jpg [6]: https://i.sstatic.net/lqyg7.jpg