As an outsider, Calonice had to earn the trust of the Trév Gállorg when adventuring into Angmar and helping stop the shadow in the North. To do this, she both had to perform a Fém as well as dress up as one of them.
Any player in LOTRO knows how underused yellow is, simply because it looks horrible on most pieces. However, this outfit emerged when I jokingly dyed the leggings yellow just to see how the colours contrasted. I was pleasantly surprised with what I saw, and soon enough, I had dyed other pieces yellow as well.
Honestly, I didn't have Angmar in mind when I created this outfit. The colours of the leggings were the basis of the entire piece. However, I was beginning questing in Angmar and noticed the similarities between the shades on Calonice's garments and theirs, and decided that this was the perfect outfit to wear throughout my adventures there.
I'm quite thankful I used quite a decent amount of yellow. As Angmar is such a gloomy place, much like Moria or Mirkwood, the yellow gave me brightness in the darkness; that would ultimately be the reason I managed Angmar, as I easily get discouraged and bored in dull environments, just like Calonice evidently does.
I was also - and am still - amazed by how well the Steed of Rivendell goes with this outfit, despite it being from a completely different faction and a colour scheme for a completely different purpose. Still, it's good that the mount uses a lot of yellow, which almost justifies my use of yellow in my outfit.
Head: The Beast-keeper's Hat (gold);
Shoulders: Fine Mathom-hunter's Mantle (burgundy);
Chest: Isengard Prisoner Shirt (yellow);
Hands: Elven Steel Gauntlets of Courage (burgundy);
Legs: Ceremonial Trousers of the Stone-student (yellow);
Feet: Ceremonial Boots of the Brazen Call (yellow).