I recall that there was some variation among the Narn of Babylon 5
Related 'fact' (some slight disputes, but sounds good, so I'm rolling with it), regarding the Centauri race's styling. In particular the hair-styling.
Londo (or his actor, Peter Jurasik, rather) went into make-up to prep him for the so-far-undecided hairstyle he was to get to represent the 'ancient and decadent republic' theme. They drew his hair back in the now-familiar fashion just to get ready for the final decision of what to do with it by JMS. JMS saw it like that and thought that was
their proposal, and liked it, so it quite literally stuck like that!
(There's a lot of discussion about the hairstyle in season 1 being not as neat as in later seasons, but (in-universe) that can be explained by Ambassador Mollari was in a dead-end position with only a degree dead-end pride in his appearance. His social status entitles him (by long-standing standards) to the length of the hair-crest, but he's too interested in various leisure activities and too surrounded by non-Centauri to take too much care. His star rises (and, even when it isn't doing, he's
trying to make it rise) in later series and so he takes more pride in his appearance. Naturally, in a patriarchal society (ostensibly so, anyway, Londo's three differently-scheming wives show that the females of the species could at least sometimes be quite formidable background powers), their women have
zero status and thus no 'fan' at all (or restrict themselves to a ponytail from an otherwise bald head). And an emperor can do what he likes. So, when a new one comes along who wilfully overturns the old standard, he is of course copied by many an ingratiating lacky. But not Londo, who is a traditionalist who has no interest in changing his accustomed ways.)
Of course, there's a lot on B5 that is intriguing in that way. Separating that which is canon from that which is fanon is a sometimes thankless task, though.