@elisadevelon Is that separate sword a model replacer or an entirely different weapon?

It's a wild guess since I have practically no knowledge on modding, but it could be an name/address-related issue in the files (or a different matter altogether...) if the game can't find/read/show that weapon, so you could try to run some tests for it and perhaps make a dress-only version of this mod in the meantime to see if the default sword works correctly with it.

@AceProject29 that's funny. I was hoping he'd be using the separate sword in the files. Well, to make the sword visible, he'd probably have to have it attached to his hand all the time and that would probably be even more weird.

During the cutscene at the base, while retrieving of the Regalia, Ravus sword was invisible.
Don't know if was because of this mod or not, but I have no weapon replacement mods or other mods active for that character beside this one...