Halloween Discussion Forums, Costumes, Horror!

that looks awesome!

So earlier this year i got this:
http://www.rockworldeast.com/store/BAGS,Backpacks/Ghostbusters_Backpack_Proton_Pack
and now I want to be one of the Ghostbusters for Halloween.
Constructive ideas on how to make the rest of the costume? The proton pack is really the hardest part, so at least I have ...

lol! solid advice.