Frogged the first one, just not my colour. Started another one with the same specifications, but another colour.

Gauge with 3.75mm needles: 19 sts, 28 rows = 10x10cm after blocking
Original Gauge (from pattern): 24 sts, 32 rows

Multiplier for stitch count: 0.8
Multiplier for row count: 0.9

Let’s hope that the theory prooves to be right in reality…

With my yarn/needle specifications for size 38” I cast on 1-6-30-6-1 (Front-Sleeve-Back-Sleeve-Front).
Repeating the following 2 row-repeat 10 times (instead of 11).
Repeating the 4 row-repeat after that 9 times (instead of 10).