I was inspired by the Acherus Knight's Battleplate to make a skirted Death Knight set. The Sanctum of Domination plate belt models are a good way to add 3-D elements to any plate skirt for those races whose stances don't make the belt clip.
Item List: Head: Demongaze Helm (Normal, death knight only) Shoulders: Grave-Dredged Pauldrons (Raid Finder) Back: Hidden Chest: Gravewarden Chestplate (Raid Finder, death knight only) Shirt: Common White Shirt Wrist: Hidden Hands: Gravewarden Handguards (Raid Finder, death knight only) Waist: Unchained Gladiator's Plate Girdle Legs: Noblewoman's Skirt Feet: Boots of the Funeral March (Heroic) Weapon: Kiril, Fury of Beasts (Heroic)
Wowhead outfit link: Robed Gravewarden