all of the Bills have the same length in that pic, its just how their uni's are.
But in NCAA you have the option to have short, mid or long socks. They should do something similar in Madden. Basically you have the option of having the solid color longer, standard, or high. Longer would mean more of the solid color like we all would like to see but still have some white so its not just all solid color, standard would be what it is now which is about halfway down the calf, and high would be where its slightly below the knee so theres more white than solid color.
I think something like that would work and seems easy enough to add. Maybe next year thats something they can consider.