Alternate cable cast-on.

3,5mm for ribbing and 3,75mm for body.
Suspended bind-off for body, and Italian/tubular/invisible ribbed bind-off for sleeves.

Will try this size for my fingering yarn, hope it will do the job (no, I don’t swatch ;o)

My stitch count was completely off for body and sleeves separation. For size 4, I should have 324 stitches, ended up with 288!!! I’m good with pattern repeat (18) but off with stitch count.
So I followed size 2 for body and sleeves separation and cast-on 16 stitches at underarms (for more ease).
I don’t know what went wrong, I maybe have forgot an increase at the end?

Anyway, it’s fit me so everything is fine \o/

Had 70 stitches on sleeves, did less decreases. Ended up with 56 stitches for ribbing.