Dressmaking, Sewing & Alterations Job - Monte Vista, WC, 7460

Good day, I have a midi length black stain dress that I would like to make into an open back dress. The front has ribbing and it already has a zip in the back that I’m hoping would just be able to be folded open to create the v shape backless look I have in mind. I would like to wear the dress to a wedding on the 16th of December. I will attach photos below of what I am trying to explain. The dress needs no other alterations just to open the back and sew it down I’m hoping.