I can think of a good example.
Bajorans wear earrings (my guess is it is supposed to hold their pah, as that's where they seem to think it's stored). It's a Bajoran cultural touch, much like Worf's sash. Yet, Picard forbade Ro Laren from wearing hers, citing how it wasn't part of a Federation uniform. Neither is worf's sash, yet I remember him in the gold uniform, at tactical, with the sash displayed proudly across his chest.. and it's even more obtrusive than the earring!
Now, obviously the Federation doesn't play cultural favorites, so the obvious assumption (whether it's correct or nto is anyone's guess) is that Worf wears a political adornment, so it's okay, while Ro wore a religious adornment, so it's wrong.
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