Welcome to our site. Hope you stay and play! The length you refer to I assume is in the body of the garments, which really has no "option" as a long or short.
You mention you are a 42-44 size, which is my size as well, and I purchase XL in all my FJ outerwear. This helps me get teh proper size for sleeve length more than anything, because I am 6'3".
In the FJ shirts I wear a large, as the FJ body sizes are generous, so that would probably work for you as well.