In the patch notes it said "duplicate gear will be removed from your inventory". I still got the hunter armor twice and still got the galloglach armor, got it at a random moment (will check if it goes away when I open chest the corresponding chest).
I completed a quest really early on in the story (just got to england and had to pledge myself to a region). When I suddenly just received the gallogliach armor piece. Apparently you unlock it from a wealth chest in Lincolnshire but I haven't even been there at all.