Vintage unique maxi dress prom or grad dress with keyhole back

This is absolutely beautiful on but it will never fit me again! I wear this in high school and it’s definitely from the 1960s. In good vintage condition with one slight repair needed under the armpit and barely noticeable run on the side. Would make a showstopping grad dress! No tags but fits approximately size 10. Measurements available upon request Feel good shopping in my closet: I use recycled packaging ♻️ 🌎 and 25% of all sales go to help victims of human trafficking in Alberta 🧡