My son wanted to be a paratrooper with a parachute. I went online and ordered a military uniform. Then I went to the local party store and purchased (4) Gold balloons in the shape of the number 1 and some white curling ribbon. It helps to have two people to construct this, one to hold the balloons the other to tape. Using packing tape, I taped the #1 balloons together. Then I tied the long strips of curling ribbon to the balloons (you probably could just tape them to the balloons too).
Then I tied the “parachute” to a camouflage backpack my son already had. This made it easier for him to take it on and off at school. My son and his friends loved it! There were some houses that he had to take it off to make it to the door to trick or treat, but other than that it was a great costume!