I’m making a simple sweater/jacket; it has one button at the top (but I plan to wear it unbuttoned, and is just the usual left front, right front, and then back piece. It is in essence the shape of a cardigan, except fitted, and is a light sweater that can be worn over anything just for an extra layer on a chilly night. The sleeves are made separately, have a slight ‘cap’ and then seamed to the armhole.
My question is: the dimensions of the pieces call for the left and right fronts to be the same length (22 inches) as the back piece. The shoulder seam sits directly on top of the shoulder.
I am concerned as to why the pattern does not call for the back to be 2 inches longer than the front pieces. Should I add two inches length to the back piece, or will it not matter since it is just an over sweater?