Vintage 60’s MCM Mod Pink Sheath Dress Ribbon Bodice Needs Zipper Repair

I believe this dress was handmade, as there are no tags of any kind. It’s beautiful, but the zipper has come detached from the dress (see detail pic). Laid flat, approximate measurements are: 16” across at the armpits 13” across at waist 40” from shoulder to hem From a smoke-free home