With smaller needle CO 218 (8+48+1+104+1+48+8) in 2 ribbed German long-tail.
Rib 2x2 for 15 more rows (p2, k2 … p2 for first, return row) ! On 7th row : buttonhole.

With larger needle, start main pattern. ! increase in beginning of next 2 rows to install icord, and put markers after 8, 49, 52, 52, 49 stitches.
Icord edging on 3 sts, 6 sts in garter stitch, 202 sts in stockinette, 6 sts garter, icord on 3.
! Buttonhole after 7th ridge. Then every 11 or 12 ridge?
Straight to armholes. 37 cm

Will try using Hargreaves number for the armhole and sleeves. She is such a good designer for fit.
Impossible with seamless set in sleeves.

knitting the sleeves in the round until armhole.
Co 44