I'm making this sweater for my two oldest boys:
They're skinny little things, so I'm not concerned about the width of the sweater itself, but don't think that the largest size will be quite long enough in the sweater and the sleeves for my oldest. Do I have to do anything special to add some length, or is it as simple as just knitting a couple extra inches worth of stocking stitch to the bottom of the front/back/sleeves?
Yep, just knit a few more inches on the body, and for the sleeves, you can put a couple extra rows before the increases, and after the incs the pattern says to knit straight until you bind off, where you can add more length.
That's what I thought, thanks for the quick reply!