From the website:
Long and lean, this slimming vest features extra-large sizing.

Skill Level: Intermediate

Sizes: To Fit Bust: 30-32 (34-36, 38-40, 42-44)“.

Finished Bust: 41 (45, 48¾, 52½)“

Supplies:Aunt Lydia’s® “Cable Crochet”, Size 3 thread, Art. 175, 100% mercerized cotton, (200 yard balls). Amount: 14 (16, 17, 18) Balls No. 12 Black.

GAUGES: 19 sts = 4”; 12 rows = 4” in pat; 17 sts = 4”; 8 rows = 4” in dc. CHECK YOUR GAUGE. Use any size hook to obtain the gauges given.

Gauge Swatch: Ch 24. Work in pat for 12 rows. Swatch should measure 4¾“ x 4”.