Is your zipper always going down? Why not put a key chain ring into the loop of your zipper? In that way it would be easy for you to pull up your zipper and after pulling up your zipper, put the key chain ring to the button of your jeans so it won’t fly down. The key chain ring will hold the zipper to fly down; it will conceal and will not get you caught with your zipper open. There are lots of sizes for key chain ring, just choose the smallest one or at least that ring that is fit on the button of your denim.