I.MAGNIN 1960s smocked mock neck midi dress

Gorgeous 1960s vintage I.MAGNIN peach colored midi dress. Back zipper. Smocked elastic upper/sleeves. Mock neck. Flared sleeve cuff trim. Empire waist. Dress is in outstanding vintage condition, was just dry cleaned before listing. No fabric content/size tag. Feels like a poly blend of some sort. Best fits a modern size XS. Length 37” pit to pit 14” but has stretch to it. Waist flat across 13.5” hips flat across 22.5”. D-83