Here is McCalls Pattern # 6666 UNCUT Misses Blazer in size 18 --Bust 40 inches – Waist 32 – Hips 42 inches. Loose-fitting, lined or partially lined jacket has front darts, center back seam, side panel (no side seams), two-piece sleeves. Lined or partially lined jacket A has lines sleeves and patch pockets. Views B and C have welt pockets and optional flaps.
The pattern and instructions are still factory folded. The envelope shows some wear and creases from age and storage.