Cast on 5 extra sts then didn’t decrease. That way the button bands work out at 4sts each as the pattern has a garter st at each end.
Neckband worked 6 rows of garter usong 2.75mm with buttonhole at end of 5th row. Further buttonholes have 10 garter ridges in-between.
Changed to 3mm for yoke.
Sleeves and body worked seamlessly and longer than in pattern to about 5.5-6”.
Picked up 4sts under arms for sleeves then decreased on each alt row.
On last knit row worked k1, (k2tog, k2), to last 3 sts then k2tog, k1.
Cuffs in garter st using 2 75mm.
Decreased by 2sts on 20th row from last YO, then each 15th.

Hemline used 3mm needles and cast off on 5th garter ridge.