i would guess that it would fit the same as the line hoodies, because they are owned by k2 sports. if this is the case, i'd go xl. you said kinda big, i'm 5'9" and i have the team sized line hacket and it's only a few inches from my kneecap. but if you want it to brush your knees, go for the team size.
or i'm totally wrong and it fits differently and this post is completely useless. if so, good luck.