Seriously great work, I love the dedication to perfectly matching the camo textures! You probably don't need the under suit for Halloween, but if you feel you must have something you can do what I did and cut the cushion part of an old backpack and hang it from the chest piece with the cushions facing forward. Its quick and cheap, and at least fills in the gaps with something similar to the in-game texture. That said, I don't think you need it, it looks so good right now!