Knit in one piece. Gauge slightly off so I opted for a slightly adjusted size 4 to fit my size 3 measurements.

Gauge
4.0mm: 24x32 // 24x34
4.5mm: 22x29 // 21x31

Knit notes
Tubular co 198sts (49-100-49).
2x2 16r.
Switch to larger needles and start st st. In first r, inc 1st on each end of both fronts (51-100-51 = 202).
Incs in patt:
Fronts: r3 - 9 - 15 - 25 - 33 - 41
Back: r3 - 9 - 15 - 21 - 41 (should have been one more but I forgot) (57-110-57 = 234).
Continue straight in pattern.

Front shaping (neckline): r57 - 59 - 63 - 67 - 71 - 75 - 79 - 83 - 87 - 91 (of patterned rows).
Armholes:
BO 14sts each in r67 (46-96-46 = 188),
then dec 1st each side ev r 7x (r68-74) (38-82-38=158),
ev other r 5x (r76 - 78 - 80 - 82 - 84) (30-72-30=132),
ev 4th r 2x (r88 - 92) (26-68-26=120).
Continue front shaping in r95 - 99 - 103 - 107 - 113 - 119 (20sts left) (stretched and reduced number to accomodate for my different stitch counts).

Back:
144r of pattern before back neck: 66 + 26 for armhole decs + 52.
68sts (vs. 72), -5/-5 (=58 vs. 60), -6, bo10.
Rejoin, bo 26 centre sts.

Armholes:
108sts, 10r, tubular bo

Buttonband:
pick up 53 - 64 - 28 - 64 - 53
button holes in r10 + 9r + tubular bo