This.
The cloth parts can look pretty decent with a wash on a base coat.
For the armors, it might look a bit too flat, unless you do some type of pre-shading like on the 1st link above.
If you go that route, I would recommend a dark color for the cloth, and a lighter one for the armor plates. That way, when you paint the armor after the cloth, small errors won't be as noticeable (as a light wash on a dark fabric won't show too much).
Inquisition-based colors (black cloth, red armor) looks pretty mean. Red is always a bit tricky to highlight, but if you're going the quick and dirty road and don't bother with edge highlighting, you might get away with it.
So prime white, use a black wash on all the cloth parts (probably two coats), then a red on the armor. Maybe two coats too to get a deeper red.