This is a shawl collared vest, the shawl is knitted first. Once completed, stitches are picked up along the centre of the shawl and knitted down creating a back piece, the sides of the back piece are then sewn to the side edges of the shawl to create a vest.

There is an errata for this pattern for the left front.

Left front
Cable row 1 (RS): K5, yo, SSK, K5, C20B, K5, yo, SSK, K5, (yo, SSK, K2tog, yo, P4) twice, yo, SSK, K2tog, yo, K4.
Cable row 2, 4 & 6: K8, P4, K4, P4, K8, P4, K4, P20, K4, P4, K4.
Cable row 3: K5, K2tog, yo, K30, K2tog, yo, K5, (P4, K4) 3 times.
Cable row 5: K5, yo, SSK, K30, yo, SSK, K5, (P4, K4) 3 times.
Cable row 7: K5, K2tog, yo, K30, K2tog, yo, K5, (P4, yo, SSK, K2tog, yo) twice, P4, K4.
Cable row 8, 10 & 12: K4, (P4, K4) 4 times, P20, K4, P4, K4.
Cable row 9: K5, yo, SSK, K30, yo, SSK, K9, P4, K4, P4, K8.
Cable row 11: K5, K2tog, yo, K30, K2tog, yo, K9, P4, K4, P4, K8.
Cable row 13: K5, yo, SSK, K30, yo, SSK, K5, (yo, SSK, K2tog, yo, P4) twice, yo, SSK, K2tog, yo, K4.
Cable row 14, 16 & 18: K8, P4, K4, P4, K8, P4, K4, P20, K4, P4, K4.
Cable row 15: K5, K2tog, yo, K30, K2tog, yo, K5, (P4, K4) 3 times.
Cable row 17: K5, yo, SSK, K30, yo, SSK, K5, (P4, K4) 3 times.
Cable row 19: K5, K2tog, yo, K30, K2tog, yo, K5, (P4, yo, SSK, K2tog, yo) twice, P4, K4.
Cable row 20 & 22: K4, (P4, K4) 4 times, P20, K4, P4, K4.
Cable row 21: K5, yo, SSK, K30, yo, SSK, K9, P4, K4, P4, K8.
Cable row 23: K5, K2tog, yo, K30, K2tog, yo, K9, P4, K4, P4, K8.
Cable row 24: K4, (P4, K4) 4 times, P20, K4, P4, K4.
These 24 rows form the cable and lace patt.
Work these 24 rows 5 times more, (total 144 rows in cable and lace patt from marker).
Next row (RS): K5, yo, SSK, K5, C20B, K5, yo, SSK, K5, (yo, SSK, K2tog, yo, P4) twice, yo, SSK, K2tog, yo, K4.
Next row: (K4, P4) 4 times, K4, P20, K4, P4, K4.
Now work 20 rows in rib setting sts as folls:
Rib row 1: K5, K2tog, yo, K1, (P4, K4) 3 times, P4, K1, K2tog, yo, K1, (P4, K4) 3 times, K4.
Rib row 2: (K4, P4) 8 times, K4.
Rib row 3: K5, yo, SSK, K1, (P4, K4) 3 times, P4, K1, yo, SSK, K1, (P4, K4) 3 times, K4.
Rib row 4: (K4, P4) 8 times, K4.
These 4 rows form the rib patt.
Work these 4 rows 4 times more, (total 20 rows in rib).
Next row: K5, K2tog, yo, K1, (P4, K4) 3 times, P4, K1, K2tog, yo, K1, (P4, K4) 3 times, K4.
Next row: (K4, P4) 8 times, K4.
Next row: K4, (K4, P4) 7 times, K8.
Turn work and cast off in rib on WS.