has chevrons of knits and purls going up the sweater and up the sleeves. When you increase, no matter which row of the pattern, you want to maintain that progression. Look at the pattern of sts on your needles and incorporate the increases whether knits or purls.
In these cases, I usually increase by adding a knit st no matter what and then on the next row, fit the increase into the pattern. The edge sts will probably become part of the seam anyway.
Very sweet jacket!