This armor set is privateer's uniform worn by deadly seafaring mercenaries that hunt down and deal with pirate threats. These seagoing warriors are skilled in the ways of sabotage, assassination, and sea and land survival.
Due to a bug in The Legend of Dead Kel chests containing this armor respawn after a time, and so multiple copies of the armor can be found.
The +2 to finesse abilities upon wearing the 4th piece doesn't show up on abilities screen. There are yellow arrows indicating an increase but they stay at 5 of 5 or 6 of 6 instead of adding the two levels.