Vintage 60/70s Andrea Gayle red sleeveless gathered maxi dress, size medium

So pretty! Sleeveless with rear zipper neck and high tab closure. Front diamond gather. Minor wear on fabric, no holes or stains. Structured shoulders. Please see all pictures. Union made in the USA. Tag 14, but fits like a modern day medium. Mannequin is size 6/8 for reference. Color cherry red. Material feels like polyester blend. Pit to pit is approximately 17” across laid flat. Waist area is 14” and length is 57”. From smoke/pet free home. Reasonable offers welcome!