This pattern is from the book Blueprint Crochet which is available in print and eBook form. It is also available as a single pattern download from the Interweave Store.

Yarn: Fingering-weight (#1 Super Fine)
Shown: Lorna’s Laces Shepard Sock (80% Superwash Wool, 20% Nylon; 215yd 196.5 m/ 2 oz 57 g): pine (MC), 4 (5,6,7) hanks; natural, 1 (1, 2, 2) hanks.
Hook: US F/5 (3.75mm) or hook needed to obtain gauge.
Notions: Tapestry needle; straight pins and steaming iron for blocking.
Gauge: 22 st (1.5 SR) by 12 rows (1.5 RR) = 4 x 4” (10 x 10 cm) in Eyelet Stitch Pattern
Size: Small, Medium, Large, X-Large fits 28 (34, 39, and 45)“ (71.5 86.5, 99, 115.5 cm) bust circumference.
Vest shown in size Medium.