Jessica McClintock for Gunne Sax mermaid gown

Gorgeous dress from the iconic brand Jessica McClintock for Gunne Sax. Small mark at the back near the bottom hem (see photo); not too noticeable as it is covered by the lace overlay. Vintage late 80s or early 90s (I think?). Size says 7/8 but it is quite small—could barely zip it up on the mannequin, a US standard size small. Might have been taken in. The newest piece in my small collection from this awesome line.