Black Francesca's dress. (broken zipper)

Black Francesca's dress. Size large. Fitted body. Worn once. It will need repaired because the zipper fell off. I was going to just get rid of it but it is so gorgeous I couldn't bring myself to do it. It seems like an easy fix but I know nothing about dress repairs. The detailing on the front is so pretty though. And the sleeves are sheer which I thought might look bad but it is so pretty on. I'm not sure how much repairs will cost so make an offer, would really love for this to be worn again.