My lack of sewing skills is your gain

I am obsessed with this dress. I wore it once and have no idea what happened, but the stitching came undone at the bottom of the zipper and the zipper fell off (see pic). I have no idea how to sew and it has been sitting in my closet for too long. Charlotte Russe size M super comfortable, worn once to a wedding. It is absolutely beautiful in person It is essentially a strapless romper with shorts and has a piece that flows to the floor around it. It's a brownish grey color and the flowers are Burgandy, black, grey and pink