Field Marshal's Vestments is the Level 60 PvP Epic Set. It contains 6 pieces. Has set bonuses at 2, 3, and 6 pieces.
Field Marshal's Leather Chestpiece
Field Marshal's Leather Epaulets
Field Marshal's Leather Mask
Marshal's Leather Footguards
Marshal's Leather Handgrips

Marshal's Leather Leggings

Set Bonuses
Wearing more pieces of this set will convey bonuses to your character.
2 pieces: +20 Stamina.
3 pieces: Reduces the cooldown of your Gouge ability by 1 sec.
6 pieces: +40 Attack Power.