From Vintage Patterns:
"Simplicity 3948; ca. 1961; Misses' Nightgown in Three Lengths and Panties: Nightgown, all views, have lowered gathered neckline and ribbon binding. V 1 and 2 are sleeveless and have ribbon tie belt. Long length V1 has self fabric shoulder straps and heavy lace trim. Dress length, V 2 has lace edging and ribbon shoulder straps. Shortie nightgown V 3 has lace edging, elastic at shoulder and lower edge of short puff sleeves and ribbon bow. Panties have elastic at waistline. Legs have lace edged self ruffles formed by elastic in casing."