I've prepared a uniform with the pieces you obtained. It is magically enhanced to complete the illusion.
We spotted Commander Dawnforge going in to meet Arcanist Ardonis a few minutes ago. He had a full retinue of guards with him, so whatever they're discussing is bound to be incredibly important; see if you can catch any of it.
Oh, I almost forgot. You'll want to stay away from the arcane golems patrolling the manaforge. They will see right through the illusion.