I have noticed that there are unique items in the game marked with green letters. I don´t know if they are part of a set but they have some special bonuses which become instantly yours after you wear them. There are also some items marked with orange letters and I think that those are parts of sets. The effect that the whole sets has on your char. I really do not know it since I am not that far in the game and I have not completed a whole set yet. But One thing I like very much is that when you change the items you wear the difference is obvious in your char. And unique items (green) have many many bonuses.
