For the bomb, it was simply made out of duck tape dress. Once it was on, we got red construction paper and folded them into 4 tubes. We connected the tubes with random wiring found around the house and had duck taped them onto the duck tape dress. We then found a timer and had wired it together with the red tubes. Add some tights and boots and the costume is complete.
For Osama, we found a bunch of camo gear around the house, along with a bed sheet for his head and the bottom half of his costume plus the wig that we had found too.