Chart #166 from the Japanese Knitting Stitch Bible. CO 40, join, being careful not to twist.
K a round.
P a round.
Next round (K 19, P 1) twice.
Next round begins 2nd row of chart: (K5, P9, K5, P1) twice.
Continue working sts 1-20 twice each round, following chart through Round 16.
Round 17: (M1, work chart sts 1-19, M1, P1) twice; 44 sts
Rounds 18-32: P1, work chart sts 1-19, P3, K19, P2; then return to chart round 1
Rounds 1-17: P1, work chart sts 1-19, P3, K19, P2
Round 18 (right hand mitt only): P1, work chart sts 1-19, P3, work thumb trick with waste yarn over next 7 sts, K12, P2
Round 18 (left hand mitt only): P1, work chart sts 1-19, P3, K12, work thumb trick with waste yarn over next 7 sts, P2
Round 19: same as rounds 1-17
Round 20: K2Tog, work chart sts 2-18, SSK, P1, K17, SSK, P1; 40 sts
Rounds 21-32: Work chart sts 1-20, K 19, P1; return to round 1 on the chart
Rounds 1-4: work chart sts 1-20, (K1, P1) ten times
Next round: (K19, P1) twice
Purl a round
Knit a round
BO loosely in Purl
Thumbs: carefully remove waste yarn, putting sts above and below on needles. K a round, picking up and knitting an extra st in each corner; 16 sts (if fewer, inc in the next round)
K 9 more rounds
Purl a round
Knit a round
BO loosely in Purl, break yarn, leaving an 18” tail
Work in ends, using long tail to fill in gaps at thumb corners.
Enjoy!