70s Yves Saint Laurent Girls Dress

What a treasure of a dress! Crazy rare 1970s Yves Saint Laurent girls dress very reminiscent of the 1976 Russian collection, though I can’t definitively date it. Condition: practically new with no flaws to note. Sizing: technically this is a child’s size 12, but would fit a women’s xs. My measurements are bust: 34” waist: 24” and I’m 5’8”, and it would fit perfect if I were two or three inches shorter. Measurements: Bust: 34” Waist: 24”-32” (partially elastic) Full length: 40”