Yes, because the buttons are still representing shiny buttons that have got a bit duller (a patina) through age

However, Argyll/Braemar jackets are SEMI formal jackets. That makes them versatile and suitable for wearing at slightly more formal daytime events. In practice they are worn to most events that require you to look smart

Simply dress it down with plain leather sporran and it is the equivalent of a business suit. Formal, but not too formal

Just watch when you dress it up for the evening events that you match the antique finish across other accessories like kilt pin, sgian dubh (maybe), belt buckle etc otherwise you could end up looking a bit odd