70s Metallic Champagne Muse Style Gown ILGWU Union Made Maxi Dress Size Medium

Vintage 1970s metallic champagne muse style V-neck gown. Union made maxi dress has fluttery open shoulder kimono sleeves, gathered waist, v-back, thigh high slit, and self belt with oversized faux pearl detail. Back zip with hook and string eye closure. No material tag but feels like a lightweight polyester crepe. Bodice is lined, sleeves and skirt are not. There are a few dropped stitches on the slit and dress is missing one inner hanger but otherwise dress is in excellent condition. No damage or vintage odors. Smoke free home. Vintage tag size 9. This looks like it would fit like a size medium but please use measurements for best fit. 20” ptp 14.5” across waist (waist does not have stretch) 24” across hips 59” long shoulder to hem 51” pit to hem