Step 7: Done!
Anyway, with this reactor, you can be casual Tony Stark and just throw on some nice slacks and a watch to go with your shirt.
Or you can be Prisoner of War Tony Stark and dirty yourself up a little bit, get a green army jacket, wear a drab-colored beanie (grey, olive, brown) grow out a little beard, and wear some beat up pants/shoes.
Depending on how thick your finalized reactor is, it might behoove you to NOT hold your shoulders back as much as you probably do normally (otherwise your reactor will stick out against your shirt and look a tad strange). Bad posture can make the reactor look more like it's a part of your chest rather than sitting on top of it so -- for once in your life -- it's perfectly fine to slouch.