Modifications:

CO with first body row below collar ribbing on larger needles and picked up the collar later.

I used a half twisted rib for the collar/cuffs/body ribbing.

Cable CO under arms with an extra stitch in each corner then k2tog on first round to close any gaps in the corners under the arms.

Stripes - MC for collar and short rows and all other ribbing. 3-10-3-10 row repeat for CCs