A bit of a latecomer for any suggestions, but for your soft goods, you could go for The Darkside Closet (Linked Here) for your Undersuit, and still do Imperial Boots for your... Well, Boots, given they make boots that are closest to screen accurate from what I know. You'd likely save a substantial amount but still get what you're looking for, since you don't need some stuff like a pair of gloves (The 850 Finished comes with Gloves), and The Darkside Closet does something closer to pants as opposed to the shorts and separate knee gaskets of the IB stuff- This of course comes down to your preference on the matter.
Hope this helps!