Here is Simplicity Pattern # 8400 UNCUT Misses KNIT Dress in size 14 (Vintage 1978)
Misses “Jiffy” plus dress in two lengths and unlined jacket. SIZED FOR STRETCH KNITS ONLY. Long or short sleeveless dress has cowl and self tie belt. Jacket with long or short set-in sleeves has front and back bands.
Bust 36 inches Waist 28 inches Hips 38 inches
The pattern and instructions are still factory folded. The envelope shows some wear and creases from age and storage.