Because of the heighth of the boat neck neck, there should be more rows in the upper garment in the boat neck than in the crew. Add 1"-2" of rows.
Also because of the k3p2 pattern in the boat neck -- at least with springy yarn and a size 7 needle--, continue adding stitches at the raglan seams until there are 10 stitches extra before starting the lower garment.
