I just wear my Melee setup, which looks pretty cool.. Fighter Torso, Torags legs/Bandos Tassets, Neitiznot or Slayer Helmet, Barrows Gloves, Dragon Boots, Dragonfire Shield, and a Whip.. Otherwise, I find ghostly robes to be cool looking.. It sort of shows off the cape more, and is magic related.. Anything really will look good, but it depends on your taste. Some people may say it matches too much, or is too blue, white, or whatever.. Just do what you like, and don't worry about showing it off too much.