You don't realize how valuable that tiny tab on your zipper is until it comes off. While you might be able to rig something together, it doesn't look very professional. But what else are you going to do? Throw away the whole garment? No! Actually, you can get a new tab by replacing the whole slider. This can be done even on something like the fly zipper on a pair of pants which is what this tutorial tackles in detail. While a little time consuming, it's actually not difficult to do at all and after the repair, it will be hardly noticeable. You just need a few tools and a zipper repair kit which you can find at your local fabric store.
Fly Zipper Tab Replacement