YARN:

Abbreviations:
BO – bind off
CO – cast on
dec – decrease
dpn – double-pointed needle(s)
k – knit
k2tog – knit 2 together
LHN – left-hand needle
p – purl
p2tog – purl 2 together
rem – remain(ing)
rep – repeat
rnd(s) – round(s)
RS – right side
ssk – slip, slip, knit
st(s) – stitch(es)
st st – stockinette stitch (knit every round, or knit right-side rows and purl wrong-side rows)
WS – wrong side
yo – yarn over

Cuff: CO 72 sts. Work in st st for 5 rnds. Work k1, yo for 1 rnd. K one rnd. Work k2tog for 1 rnd. Work in st st for 4 rnds. Next rnd: k 1 live st with 1 CO st around. (To do, fold CO edge to meet live edge with WS facing. Insert LHN into the back half of one CO st from top to bottom and work together with next live st as k2tog.) P one rnd.

a close-up of the cast on stitches picked up and knit together with the live stitches on the cuff

Arm: Work k2,p2 rib for 50 rnds. Next rnd: +k2, p2tog, (k2, p2) 5 times; rep from + around.
Work even for 25 rnds. Next rnd: ^k2, p1, (k2, p2) twice, k2, p2tog, (k2, p2) twice; rep from ^ around.
Work even for 10 rnds. Next rnd: #k2, p1, k2, p2tog, k2, p2, k2, p1, k2, p2, k2, p2tog; rep from # around.
Work even for 10 rnds. Next rnd: =(k2, p1) twice, k2, p2tog, k2, p1, k2, p2tog, k2, p1; rep from = around. 54 sts rem at end of dec section. Work even for 45 rnds or until arm reaches from 2″ past elbow to just past wrist.  (Note: pattern as written will produce a very snug-fitting wrist measurement. For a larger wrist or a looser fit, eliminate last one or two decrease rnds.)

Hand: k2, BO next sts loosely until 21 sts rem on needles (31 sts BO for standard size,) k to end, k2. Turn. Beg with a WS row, work back and forth with first and last 3 sts in seed st and rem sts in st st on rem 23 sts for 21 rnds. Next RS row: work 3 in seed st, ssk, k to last 5 sts, k2tog, work 3 in seed st. Work 1 row even. Rep last 2 rows until 9 sts rem.
Next RS row: k1, p1, ssk, k1, k2tog, p1, k1. Next (WS) row: (k1, p1) to last st, k1.
Next RS row: k1, ssk, k1, k2tog, k1. Next (WS) row: k1, p1, k1, p1, k1.
Next RS row: ssk, k1, k2tog. P 1 row. K 1 row.
Cont on 3 rem sts as i-cord for 20 rows or until i-cord reaches around middle finger. Graft 3 live sts to beg of i-cord. Cut yarn and weave in all ends. Block hand. (Do not block arm so that ribbing does not lose its elasticity.)