Forestwarden ShroudElves invented this lightweight set of tunic and leggings, though it was quickly adopted by rangers and similar characters of all races.
A forestwarden shroud is worn over a suit of armor. It can be incorporated into any suit of armor during creation, or it can be added later. Its slick surface allows branches and leaves to slide easily across it, negating the effect that undergrowth and heavy undergrowth has on the wearer's Tumble and Move Silently checks (see Forest Terrain, page 87 of the Dungeon Master's Guide).
A forestwarden shroud costs 100 gp and adds 2 pounds to the weight of a suit of armor.