Here is Butterick Pattern # 3771 UNCUT Misses Dress Duster sizes 14, 16 and 18. Semi-fitted duster A or B has front and back darts, front button and thread loop closure, hemmed front and side edges and collar (Mandarin style I believe). Dress is sleeveless and pullover with front darts. Topstitch trim.
Chest from 36 inches to 40 inches
Waist 28 inches to 32 inches
Hips from 38 inches to 42 inches
The pattern and instructions are still factory folded. The envelope shows just a little wear, creases from storage—small bit of damage to the front of the envelope.