Hello! I'm new at this forum, as I'm just starting my way into vintage clothing. And I'm loving it I'm still trying to date this Rive G Gauche navy wool jacket. According to my research, the buttons should be a bit different (they are usually studded or gold textured), but I think it's from the 1980s.
80s for sure... I can't see the detail in the buttons, so sorry but they look like replacements added in the 80s as well.
It could be early '90s, as the shoulder pads don't look as big. Agree the buttons have been replaced.