This vest is worked back and forth from the bottom up, with the front and back worked separately.
The shoulders are shaped using short rows.
After the body is seamed, the neckband and armbands are picked up and worked in 1×1 ribbing in the round.

FINISHED MEASUREMENTS

Bust: 98 (104, 108) cm / 38.5 (41, 42.5) inches
Back shoulder width: 38 (40, 42) cm / 15 (15.75, 16.5) inches
Length:54 (59, 63.5) cm / 21.25 (23.25, 25) inches

Shown in size M (women ) with 15 cm / 6 inches of positive
ease at the bust, and in size LL (men) with 13 cm / 5 inches of positive ease at the bust.

MATERIALS

Yarn
Aran weight yarn,
approx 500 (575, 645) meters / 545 (630, 705) yards.

Sample yarn used:
Rowan Felted Tweed Aran
(50% Wool, 25% Alpaca, 25% Rayon ; 87 m / 50 g)
Size M: Color 719, 6 balls
Size LL: Color 759, 8 balls

Recommended Needles
JPN #7 / 4.2 mm knitting needles (larger needle)
JPN #6 / 3.9 mm knitting needles and circular needle or
a set of DPNs (smaller needle)
Or size needed to obtain gauge

Notions
JPN #6/0 / 3.5 mm crochet hook (for shoulder seam)
Stitch markers, locking stitch marker, stitch holder or waste yarn

GAUGE
With larger needle: 17.5 sts / 24 rows = 4 in / 10 cm in stockinette stitch
Note: Gauge is taken after blocking.

Imformation is here