I've definitely been in a position where I need to put in a zipper, but the zipper I have is too long.  There is a solution to this dilemma and it doesn't involve going all the way back to the fabric store.  Do you know that you can actually shorten most polyester zippers?  Yes, you can and it's really easy to do!  In fact, being able to shorten zipper may mean that you'll have access to a bigger selection of zipper colors at your fabric store.  See how it's done and then try it yourself.