Vintage purple geometric button up dress

Such a pretty dress for the fall! In good used condition with minimal signs of wear. A small hole on the back Appears to be independently produced or home sewn so does not have a sizing or contents tag. Fits like a modern medium in my opinion Length- approx 39” Armpit to armpit- roughly 20” laid flat across at batwing seam Waist- a little over 14.5” at the stretchy seam Tags- dark monochrome VTG 80s 90s style triangle shapes