Swatching and searching for a pattern - seamless, top down, and fairly plain,
so topdown, seamless, short rows and saddle shoulder - it seems to work, had to return to buy more yarn - as he is tall tall tall.
stalled at the sleeves - that and possum yarn sheds, and is warm which is not really warm weather knitting.
all done and fits well, and he wears and wears it and cares when it pills (even bought himself a thing to remove them!)
knitworthy = Yes