For example, I made a masturbation toy casing out of two bottles, and I also managed to MacGuyver one of these:
http://www.saintsandsinners.com/image/cache/data/harris3/harris6/rimba-body-harnas-met-cockring-50-mm-500x500.jpg
what did I use for that one? A pair of old suspenders.
https://images-na.ssl-images-amazon.com/images/I/41a1GV8POVL.jpg
That image isn't mine, but the same design. The 4 clips on it form the hole for your junk, and well, you have the crossover at your ass and the two arm holes go over the shoulders. if yours has enough give you can even make a second cross by pulling the loops over your head. I think I know why those things are so appealing now, I have no idea why they make you so hard....