Errata:
The instructions on the back armhole and neck shaping just after…
“Repeat last 4 rows once more – 44 (50, 56, 70, 82) sts”
…should read:

Work 6 rows even
Next row (armhole shaping row – RS): K1, SSK, K to last 3 sts, K2tog, K1
Next row (WS): P all sts
Repeat last 8 rows 2 (2, 3, 3, 4) more times – 38 (44, 48, 62, 72) sts
SIZES SMALL AND LARGE ONLY: work 5 rows even
ALL SIZES:
Next row (RS): K 10 (12, 12, 12, 12), BO 18 (20, 24, 38, 48), K10 (12, 12, 12, 12)

Also, the dimensions for the armholes on the schematic are inaccurate. Your armholes should come out 3” - 3.5” deeper after blocking

Description from Knit Picks:

Classic meets contemporary in this feminine sweater vest that is perfect for layering. The diamond cable pattern is reminiscent of traditional color work argyle and follows the neckline in two smaller coils to the shoulders. This vintage-esque garment is a flirty and versatile addition to your cold weather wardrobe.

SIZES:“ xsmall = 30” bust (small = 33”, medium = 36”, large = 41”, xlarge = 46”)