From the description in Cool Crochet:

Decreases are cleverly hidden within the fabric of this A-line duster coat. Its strong vertical lines will flatter any figure!

Sizes: 34.5, (39.5, 45, 50.5) inches bust buttoned
Total length: 45 (45, 46.5, 46.5)“

Pattern calls for 23 (25, 27, 29) balls of suggested yarn.
Additional materials: 8 (8, 9, 9) 7/8” buttons

Skill level: Intermediate