Right hand -
Cast on 48.
Rib (k2, p1) 12 rows.

Lace Pattern -
Round 1: k5, p1 around
Round 2: (k2tog, yo, k1, yo, ssk, p1) x8
Rounds 3 & 4: Repeat Round 1

Work lace rows 6 times, you will be on row 36.

Continuing with lace on the second half of the stitches (back of hand), start increasing (on even rows) for the thumb gusset (right hand), as follows:

Round 37: K5, p1 around
Round 38: K2, yo, k1, yo, k2, p1 (inc made); (k2tog, yo, k1, yo, ssk, p1) x7
Round 39: K7, p1, (k5, p1) x7
Round 40: K2, m1, k3, m1, k2, p1 (inc made); (k5, p1) x7

Round 41: K9, p1, (k5, p1) x7
Round 42: K2, p1, k1, yo, k1, yo, k1, p1, k2, p1 (inc made); (k5, p1) x3, (k2tog, yo, k1, yo, ssk, p1) x4
Round 43: K11, p1, (k5, p1) x7
Round 44: K2, m1, p1, k5, p1, m1, k2, p1 (inc made); (k5, p1) x7

Round 45: K3, p1, k5, p1, k3, (k5, p1) x7
Round 46: K2, m1, k1, p1, k2tog, yo, k1, yo, ssk, p1, k1, m1, k2, p1 (inc made); (k5, p1) x3, (k2tog, yo, k1, yo, ssk, p1) x4
Round 47: K4, p1, k5, p1, k4, p1, (k5, p1) x7
Round 48: K2, m1, k2, p1, k5, p1, k2, m1, k2, p1 (inc made); (k5, p1) x7

Round 49: (k5, p1) x10
Round 50: k2tog, yo, k1, yo, ssk, p1, K2, yo, k1, yo, k2, p1, k2tog, yo, k1, yo, ssk, p1, (inc made); (k5, p1) x3, (k2tog, yo, k1, yo, ssk, p1) x4
Round 51: K5, p1, k7, p1, k5, p1, (k5, p1) x7
Round 52: K2, m1, k3, p1, k7, p1, k3, m1, k2, p1 (inc made); (k5, p1) x7

Round 53: k6, p1, k7, p1, k6, p1, (k5, p1) x7
Round 54: k3, yo, k1, yo, ssk, k1, k2tog, yo, k1, yo, ssk, k1, p1, k2tog, yo, k1, yo, k3, p1, (inc made); (k5, p1) x3, (k2tog, yo, k1, yo, ssk, p1) x4
Round 55: (k7, p1) x3, (k5, p1) x7
Round 56: K2, m1, k5, p1, k7, p1, k5, m1, k2, p1 (inc made); (k5, p1) x7

Round 57: k8, p1, k7, p1, k8, p1, (k5, p1) x7
Round 58: K2, place next 21 sts on holder for thumb, cast on 1 st, k2, p1, (k5, p1) x3, (k2tog, yo, k1, yo, ssk, p1) x4
Rows 59 & 60: (k5, p1) x8

Continue with lace on back of the hand, rib on palm until hand is the length you like (I worked to 76 rounds total), then start 2x1 rib, as for the start of the mitt, for 12 rows and bind off.

Thumb:
Pick up and knit 3 sts, K8, twist purl and knit stitch with knit st in back, k2tog, yo, k1, yo, ssk, twist knit and purl stitch with knit st in back, k8.
Work k5, p1 for two rounds.
Work 2x1 rib for 12 rounds.
Bind off.

Knit a second mitt, reversing the shaping to the left side of the palm, for left hand.