Through years of misuse, makeshift repairs with whatever materials available and constant use, it is a rusty, highly stylized suit of power armor. The left arm of the suit was replaced with the sleeve and glove of the raider iconoclast armor, a brahmin skull substituted for the left pauldron and various bits and pieces of metal were used to patch holes in the structure of it.
This suit of armor is only worn by Ashur. You can kill him at the end of Free Labor and take it from his corpse, or reverse-pickpocket any well-repaired suit of power armor and take it from him once he equips the new armor. It can also be taken with no hostilities toward Pitt raiders by hacking the MK V turret's control terminal(75 Science Required). It is recommended to save before you remove the turret's targeting data because it may not kill Ashur and his bodyguard the first time.
If you speak to Midea or Werhner while wearing this they will compliment on how good your new "trophy" looks on you.
If the player sides with Ashur during the final quest and lets Midea live and enters conversation with her while wearing the power armor, regardless of how it was obtained, she will remark that you have replaced Ashur completely, and that you're just the same as "the old boss".
When worn, in the "EFF" section of you character's stats, the armor shows up as "Pitt power armor" rather than "Ashur's power armor".
pcps3xbox360 Ashur's power armor will display a raider iconoclast armor icon when the item is viewed in the Pip-Boy.
Behind the scenes
The armor is dark with gold colored plates. This is likely a reference to Pittsburgh's official colors, black and gold, which transfer to all of their sports teams such as the Steelers, Pirates, and Penguins.