Vintage ILGWU bright long high neck dress

Vibrant vintage boho hippy style dress. High neck with a maxi length approximately 50 inches from shoulder to hem. Sleeveless design with a zippered back. Chest measures 16/32 inches across underarm to underarm. No size tag, but I would say this fits annextra small to a small like a 2-4 size range. Dress feels like polyester, but I cannot say for sure. Unlined, lightweight, has some stretch to it. There is a slit at bottom hem for style about 18 inches that adds some flair. It has belt loops around the waist/hip area-but no belt. Made between 1964-1973, this dress is a true vintage piece and a rare find. The ILGWU Womens workers union label is a mark of quality and authenticity.