Light blue vintage gown

Lovely robin's egg blue vintage nightgown, size M/L...size and brand tag missing, but tiny bit large on the 4/6 mannequin. See measurements. Nylon. Sheer, lace-covered cups; elastic around entire gown, just under bust and across the back. 15.5" across under bust, unstretched. 22" across hips. Approx 48" from top of bust to hem. Excellent condition.